avformat/file: remove _WIN32 condition

stat is now re-mapped with long path support
in os_support.h

Signed-off-by: softworkz <softworkz@hotmail.com>
Signed-off-by: Martin Storsjö <martin@martin.st>

libavformat/file.c

@@ -154,11 +154,7 @@ static int file_check(URLContext *h, int mask)
             ret |= AVIO_FLAG_WRITE;
 #else
     struct stat st;
-#   ifndef _WIN32
     ret = stat(filename, &st);
-#   else
-    ret = win32_stat(filename, &st);
-#   endif
     if (ret < 0)
         return AVERROR(errno);