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/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