patch 8.0.1287: temp file used for viminfo may have wrong permissions

Problem:    The temp file used when updating the viminfo file may have the
            wrong permissions if setting the group fails.
Solution:   Check if the group matches and reduce permissions if not.
diff --git a/src/version.c b/src/version.c
index 4368138..89f4046 100644
--- a/src/version.c
+++ b/src/version.c
@@ -762,6 +762,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1287,
+/**/
     1286,
 /**/
     1285,