patch 7.4.1963

Problem:    Running Win32 Vim in mintty does not work.
Solution:   Detect mintty and give a helpful error message. (Ken Takata)

src/version.c

@@ -753,6 +753,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1963,
 /**/
     1962,
 /**/