patch 8.0.0790: MSVC compiler warning for strncpy in libvterm

Problem:    MSVC compiler warning for strncpy in libvterm.
Solution:   Add a define to stop the warnings. (Mike Williams)
diff --git a/src/version.c b/src/version.c
index 83e8735..e44778c 100644
--- a/src/version.c
+++ b/src/version.c
@@ -770,6 +770,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    790,
+/**/
     789,
 /**/
     788,