downcase windows include file for mingw compatability
MODIFY
mrbgems/mruby-io/src/io.c
mrbgems/mruby-io/src/io.c
#if defined(_WIN32) || defined(_WIN64)
#include <winsock.h>
#include <io.h>
- #include <BaseTsd.h>
+ #include <basetsd.h>
#define open _open
#define close _close
#define dup _dup

downcase windows include file for mingw compatability