patch 8.1.1293: MSVC files are no longer useful

Problem:    MSVC files are no longer useful for debugging.  Newer Visual
            Studio versions cannot read them.
Solution:   Delete the files. (Ken Takata, closes #4357)
diff --git a/src/version.c b/src/version.c
index 5eeec1c..21292fe 100644
--- a/src/version.c
+++ b/src/version.c
@@ -768,6 +768,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1293,
+/**/
     1292,
 /**/
     1291,