patch 8.2.2793: MS-Windows: string literals are writable with MSVC

Problem:    MS-Windows: string literals are writable with MSVC.
Solution:   Add the /GF compiler flag.  Make mch_write() safer. (Ken Takata,
            closes #8133)
diff --git a/src/version.c b/src/version.c
index 01ec9a1..07a1e04 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2793,
+/**/
     2792,
 /**/
     2791,