Fix core:c/libc Windows compilation errors by linking to the right libraries.

Fix some name typos and missing types in Windows.
Add explicit cast on MB_CUR_MAX

core/c/libc/complex.odin

@@ -2,7 +2,11 @@ package libc
 
 // 7.3 Complex arithmetic
 
-foreign import libc "system:c"
+when ODIN_OS == "windows" {
+	foreign import libc "system:libucrt.lib"
+} else {
+	foreign import libc "system:c"
+}
 
 @(default_calling_convention="c")
 foreign libc {

core/c/libc/ctype.odin

@@ -1,6 +1,10 @@
 package libc
 
-foreign import libc "system:c"
+when ODIN_OS == "windows" {
+	foreign import libc "system:libucrt.lib"
+} else {
+	foreign import libc "system:c"
+}
 
 // 7.4 Character handling
 

core/c/libc/errno.odin

@@ -2,7 +2,11 @@ package libc
 
 // 7.5 Errors
 
-foreign import libc "system:c"
+when ODIN_OS == "windows" {
+	foreign import libc "system:libucrt.lib"
+} else {
+	foreign import libc "system:c"
+}
 
 // C11 standard only requires the definition of:
 //	EDOM,

core/c/libc/math.odin

@@ -4,7 +4,11 @@ package libc
 
 import "core:intrinsics"
 
-foreign import libc "system:c"
+when ODIN_OS == "windows" {
+	foreign import libc "system:libucrt.lib"
+} else {
+	foreign import libc "system:c"
+}
 
 // To support C's tgmath behavior we use Odin's explicit procedure overloading,
 // but we cannot use the same names as exported by libc so use @(link_name)

core/c/libc/setjmp.odin

@@ -2,7 +2,11 @@ package libc
 
 // 7.13 Nonlocal jumps
 
-foreign import libc "system:c"
+when ODIN_OS == "windows" {
+	foreign import libc "system:libucrt.lib"
+} else {
+	foreign import libc "system:c"
+}
 
 @(default_calling_convention="c")
 foreign libc {

core/c/libc/signal.odin

@@ -2,7 +2,11 @@ package libc
 
 // 7.14 Signal handling
 
-foreign import libc "system:c"
+when ODIN_OS == "windows" {
+	foreign import libc "system:libucrt.lib"
+} else {
+	foreign import libc "system:c"
+}
 
 sig_atomic_t :: distinct atomic_int;
 

core/c/libc/stdio.odin

@@ -1,6 +1,10 @@
 package libc
 
-foreign import libc "system:c"
+when ODIN_OS == "windows" {
+	foreign import libc "system:libucrt.lib"
+} else {
+	foreign import libc "system:c"
+}
 
 // 7.21 Input/output
 

core/c/libc/stdlib.odin

@@ -2,7 +2,11 @@ package libc
 
 // 7.22 General utilities
 
-foreign import libc "system:c"
+when ODIN_OS == "windows" {
+	foreign import libc "system:libucrt.lib"
+} else {
+	foreign import libc "system:c"
+}
 
 when ODIN_OS == "windows" {
 	RAND_MAX :: 0x7fff;
@@ -14,7 +18,7 @@ when ODIN_OS == "windows" {
 	}
 
 	MB_CUR_MAX :: #force_inline proc() -> size_t {
-		return ___mb_cur_max_func();
+		return size_t(___mb_cur_max_func());
 	}
 }
 

core/c/libc/string.odin

@@ -3,7 +3,11 @@ package libc
 
 // 7.24 String handling
 
-foreign import libc "system:c"
+when ODIN_OS == "windows" {
+	foreign import libc "system:libucrt.lib"
+} else {
+	foreign import libc "system:c"
+}
 
 foreign libc {
 	// 7.24.2 Copying functions

core/c/libc/threads.odin

@@ -6,7 +6,10 @@ thrd_start_t :: proc "c" (rawptr) -> int;
 tss_dtor_t   :: proc "c" (rawptr);
 
 when ODIN_OS == "windows" {
-	foreign import libc "system:c"
+	foreign import libc {
+		"system:libucrt.lib", 
+		"system:msvcprt.lib"
+	}
 
 	thrd_success        :: 0;                             // _Thrd_success
 	thrd_nomem          :: 1;                             // _Thrd_nomem
@@ -24,6 +27,7 @@ when ODIN_OS == "windows" {
 	thrd_t              :: struct { _: rawptr, _: uint, } // _Thrd_t
 	tss_t               :: distinct int;                  // _Tss_imp_t
 	cnd_t               :: distinct rawptr;               // _Cnd_imp_t
+	mtx_t               :: distinct rawptr;               // _Mtx_imp_t
 
 	// MSVCRT does not expose the C11 symbol names as what they are in C11
 	// because they held off implementing <threads.h> and C11 support for so
@@ -52,9 +56,9 @@ when ODIN_OS == "windows" {
 		@(link_name="_Mtx_unlock")    mtx_unlock    :: proc(mtx: ^mtx_t) -> int ---;
 
 		// 7.26.5 Thread functions
-		@(link_name="_Thrd_create")   thrd_create   :: proc(thr: ^thr_t, func: thrd_start_t, arg: rawptr) -> int ---;
+		@(link_name="_Thrd_create")   thrd_create   :: proc(thr: ^thrd_t, func: thrd_start_t, arg: rawptr) -> int ---;
 		@(link_name="_Thrd_current")  thrd_current  :: proc() -> thrd_t ---;
-		@(link_name="_Thrd_detach")   thrd_detach   :: proc(thr: thr_t) -> int ---;
+		@(link_name="_Thrd_detach")   thrd_detach   :: proc(thr: thrd_t) -> int ---;
 		@(link_name="_Thrd_equal")    thrd_equal    :: proc(lhs, rhs: thrd_t) -> int ---;
 		@(link_name="_Thrd_exit")     thrd_exit     :: proc(res: int) -> ! ---;
 		@(link_name="_Thrd_join")     thrd_join     :: proc(thr: thrd_t, res: ^int) -> int ---;

core/c/libc/time.odin

@@ -2,7 +2,11 @@ package libc
 
 // 7.27 Date and time
 
-foreign import libc "system:c"
+when ODIN_OS == "windows" {
+	foreign import libc "system:libucrt.lib"
+} else {
+	foreign import libc "system:c"
+}
 
 // We enforce 64-bit time_t and timespec as there is no reason to use 32-bit as
 // we approach the 2038 problem. Windows has defaulted to this since VC8 (2005).

core/c/libc/uchar.odin

@@ -2,7 +2,11 @@ package libc
 
 // 7.28 Unicode utilities
 
-foreign import libc "system:c"
+when ODIN_OS == "windows" {
+	foreign import libc "system:libucrt.lib"
+} else {
+	foreign import libc "system:c"
+}
 
 @(default_calling_convention="c")
 foreign libc {

core/c/libc/wchar.odin

@@ -2,7 +2,11 @@ package libc
 
 // 7.29 Extended multibyte and wide character utilities
 
-foreign import libc "system:c"
+when ODIN_OS == "windows" {
+	foreign import libc "system:libucrt.lib"
+} else {
+	foreign import libc "system:c"
+}
 
 @(default_calling_convention="c")
 foreign libc {

core/c/libc/wctype.odin

@@ -2,7 +2,11 @@ package libc
 
 // 7.30 Wide character classification and mapping utilities
 
-foreign import libc "system:c"
+when ODIN_OS == "windows" {
+	foreign import libc "system:libucrt.lib"
+} else {
+	foreign import libc "system:c"
+}
 
 when ODIN_OS == "windows" {
 	wctrans_t :: distinct wchar_t;