Bring over _mingw_unicode

_mingw_unicode.h

@@ -0,0 +1,33 @@
+/**
+ * This file has no copyright assigned and is placed in the Public Domain.
+ * This file is part of the mingw-w64 runtime package.
+ * No warranty is given; refer to the file DISCLAIMER.PD within this package.
+ */
+
+#if !defined(_INC_CRT_UNICODE_MACROS)
+/* _INC_CRT_UNICODE_MACROS defined based on UNICODE flag */
+
+#if defined(UNICODE)
+# define _INC_CRT_UNICODE_MACROS 1
+# define __MINGW_NAME_AW(func) func##W
+# define __MINGW_NAME_AW_EXT(func,ext) func##W##ext
+# define __MINGW_NAME_UAW(func) func##_W
+# define __MINGW_NAME_UAW_EXT(func,ext) func##_W_##ext
+# define __MINGW_STRING_AW(str) L##str	/* same as TEXT() from winnt.h */
+# define __MINGW_PROCNAMEEXT_AW "W"
+#else
+# define _INC_CRT_UNICODE_MACROS 2
+# define __MINGW_NAME_AW(func) func##A
+# define __MINGW_NAME_AW_EXT(func,ext) func##A##ext
+# define __MINGW_NAME_UAW(func) func##_A
+# define __MINGW_NAME_UAW_EXT(func,ext) func##_A_##ext
+# define __MINGW_STRING_AW(str) str	/* same as TEXT() from winnt.h */
+# define __MINGW_PROCNAMEEXT_AW "A"
+#endif
+
+#define __MINGW_TYPEDEF_AW(type)	\
+    typedef __MINGW_NAME_AW(type) type;
+#define __MINGW_TYPEDEF_UAW(type)	\
+    typedef __MINGW_NAME_UAW(type) type;
+
+#endif /* !defined(_INC_CRT_UNICODE_MACROS) */