win32.c: suppress warnings

* win32/win32.c (CharNextExA): cast to suppress warnings by VC6.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@41837 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

win32/win32.c

@@ -50,6 +50,10 @@
 #include "win32/dir.h"
 #define isdirsep(x) ((x) == '/' || (x) == '\\')
 
+#if defined _MSC_VER && _MSC_VER <= 1200
+# define CharNextExA(cp, p, flags) CharNextExA((WORD)(cp), (p), (flags))
+#endif
+
 static int w32_stati64(const char *path, struct stati64 *st, UINT cp);
 static char *w32_getenv(const char *name, UINT cp);