fix core and libc

core/os/os_haiku.odin

@@ -0,0 +1,20 @@
+package os
+
+foreign import libc "system:c"
+
+import "core:strings"
+import "core:c"
+import "base:runtime"
+
+Handle    :: distinct i32
+Pid       :: distinct i32
+File_Time :: distinct i64
+Errno     :: distinct i32
+
+B_GENERAL_ERROR_BASE :: min(i32)
+B_POSIX_ERROR_BASE   :: B_GENERAL_ERROR_BASE + 0x7000
+
+INVALID_HANDLE :: ~Handle(0)
+
+ERROR_NONE:	Errno: 0
+