patch 9.0.0763: MS-Windows: warning for using int for size_t

Problem:    MS-Windows: warning for using int for size_t.
Solution:   Declare variable as size_t.

src/time.c

@@ -1123,7 +1123,7 @@ add_time(char_u *buf, size_t buflen, time_t tt)
 #ifdef HAVE_STRFTIME
     struct tm	tmval;
     struct tm	*curtime;
-    int		n;
+    size_t	n;
 
     if (vim_time() - tt >= 100)
     {

src/version.c

@@ -695,6 +695,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    763,
 /**/
     762,
 /**/