Add win32/include/uchar.h which is a C11 standard header. It makes Windows standalone port more C11 compliant

win32/include/uchar.h

@@ -0,0 +1,33 @@
+/**
+ * This file has no copyright assigned and is placed in the Public Domain.
+ * This file is part of the TinyCC package.
+ * No warranty is given; refer to the file DISCLAIMER within this package.
+ */
+
+#ifndef _INC_UCHAR
+#define _INC_UCHAR
+
+/*
+ * The following defines are only valid when C11 (-std=c11) is used.
+ *
+ * ... a wide character constant prefixed by the letter u or U has type char16_t
+ * or char32_t, respectively, unsigned integer types defined in the <uchar.h>
+ * header.
+ */
+
+#if __STDC_VERSION__ >= 201112L
+/**
+ * __STDC_UTF_16__ The integer constant 1, intended to indicate that
+ * values of type char16_t are UTF-16 encoded.
+ */
+#define __STDC_UTF_16__ 1
+/**
+ * __STDC_UTF_32__ The integer constant 1, intended to indicate that
+ * values of type char32_t are UTF-32 encoded.
+ */
+#define __STDC_UTF_32__ 1
+
+typedef unsigned short char16_t;
+typedef unsigned int char32_t;
+#endif /* __STDC_VERSION__ >= 201112L */
+#endif /* _INC_UCHAR */