updated for version 7.4.141

Problem:    Problems when building with Borland: st_mode is signed short;
            can't build with Python; temp files not ignored by Mercurial;
            building with DEBUG doesn't define _DEBUG.
Solution:   Fix the problems. (Ken Takata)

src/os_win32.c

@@ -2960,7 +2960,7 @@ mch_getperm(char_u *name)
     int		n;
 
     n = mch_stat(name, &st);
-    return n == 0 ? (long)st.st_mode : -1L;
+    return n == 0 ? (long)(unsigned short)st.st_mode : -1L;
 }