patch 8.1.1377: MS-Windows GUI uses wrong shell command for bash

Problem:    MS-Windows GUI uses wrong shell command for bash. (Robert Bogomip)
Solution:   Check that 'shellcmdflag' is "/c". (Ken Takata, closes #4418)
diff --git a/src/version.c b/src/version.c
index 26c4071..b2278ed 100644
--- a/src/version.c
+++ b/src/version.c
@@ -768,6 +768,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1377,
+/**/
     1376,
 /**/
     1375,