patch 7.4.1975

Problem:    On MS-Windows large files (> 2Gbyte) cause problems.
Solution:   Use "off_T" instead of "off_t".  Use "stat_T" instead of "struct
            stat".  Use 64 bit system functions if available.  (Ken Takata)

src/main.c

@@ -3186,7 +3186,7 @@ process_env(
     static int
 file_owned(char *fname)
 {
-    struct stat s;
+    stat_T	s;
 # ifdef UNIX
     uid_t	uid = getuid();
 # else	 /* VMS */