MinGW: Fix stat definitions to work with MinGW runtime version 4.0

For an overview of changes in mingwrt-4.0 see:

    http://sourceforge.net/p/mingw/mingw-org-wsl/ci/4.0.0/tree/NEWSSigned-off-by: NSebastian Schuberth <sschuberth@gmail.com>
Signed-off-by: NJunio C Hamano <gitster@pobox.com>

compat/mingw.c

@@ -491,7 +491,6 @@ int mingw_stat(const char *file_name, struct stat *buf)
 	return do_stat_internal(1, file_name, buf);
 }
 
-#undef fstat
 int mingw_fstat(int fd, struct stat *buf)
 {
 	HANDLE fh = (HANDLE)_get_osfhandle(fd);

compat/mingw.h

@@ -271,11 +271,20 @@ static inline int getrlimit(int resource, struct rlimit *rlp)
 #define lseek _lseeki64
 
 /* use struct stat with 64 bit st_size */
+#ifdef stat
+#undef stat
+#endif
 #define stat _stati64
 int mingw_lstat(const char *file_name, struct stat *buf);
 int mingw_stat(const char *file_name, struct stat *buf);
 int mingw_fstat(int fd, struct stat *buf);
+#ifdef fstat
+#undef fstat
+#endif
 #define fstat mingw_fstat
+#ifdef lstat
+#undef lstat
+#endif
 #define lstat mingw_lstat
 
 #ifndef _stati64

config.mak.uname

@@ -500,7 +500,7 @@ ifneq (,$(findstring MINGW,$(uname_S)))
 	NO_INET_NTOP = YesPlease
 	NO_POSIX_GOODIES = UnfortunatelyYes
 	DEFAULT_HELP_FORMAT = html
-	COMPAT_CFLAGS += -D__USE_MINGW_ACCESS -DNOGDI -Icompat -Icompat/win32
+	COMPAT_CFLAGS += -D__USE_MINGW_ACCESS -D_USE_32BIT_TIME_T -DNOGDI -Icompat -Icompat/win32
 	COMPAT_CFLAGS += -DSTRIP_EXTENSION=\".exe\"
 	COMPAT_OBJS += compat/mingw.o compat/winansi.o \
 		compat/win32/pthread.o compat/win32/syslog.o \