patch 8.0.1156: trouble from removing one -W argument from Perl CFLAGS

Problem:    Removing one -W argument from Perl CFLAGS may cause trouble.
Solution:   Remove all -W flags. (Christian Brabandt)
diff --git a/src/version.c b/src/version.c
index ba4f56a..902b05c 100644
--- a/src/version.c
+++ b/src/version.c
@@ -762,6 +762,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1156,
+/**/
     1155,
 /**/
     1154,