Set _O_BINARY as default fmode for both MinGW and MSVC

MinGW set the _CRT_fmode to set both the default fmode and _O_BINARY on
stdin/stdout/stderr. Rather use the main() define in mingw.h to set this
for both MinGW and MSVC.

This will ensure that a MinGW and MSVC build will handle input and output
identically.

Signed-off-by: Marius Storm-Olsen <mstormo@gmail.com>
Acked-by: Johannes Sixt <j6t@kdbg.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

compat/mingw.c

@@ -3,8 +3,6 @@
 #include <conio.h>
 #include "../strbuf.h"
 
-unsigned int _CRT_fmode = _O_BINARY;
-
 static int err_win_to_posix(DWORD winerr)
 {
 	int error = ENOSYS;

compat/mingw.h

@@ -227,12 +227,17 @@ void free_environ(char **env);
 
 /*
  * A replacement of main() that ensures that argv[0] has a path
+ * and that default fmode and std(in|out|err) are in binary mode
  */
 
 #define main(c,v) dummy_decl_mingw_main(); \
 static int mingw_main(); \
 int main(int argc, const char **argv) \
 { \
+	_fmode = _O_BINARY; \
+	_setmode(_fileno(stdin), _O_BINARY); \
+	_setmode(_fileno(stdout), _O_BINARY); \
+	_setmode(_fileno(stderr), _O_BINARY); \
 	argv[0] = xstrdup(_pgmptr); \
 	return mingw_main(argc, argv); \
 } \