patch 8.1.0995: a getchar() call resets the reg_executing() result

Problem:    A getchar() call while executing a register resets the
            reg_executing() result.
Solution:   Save and restore reg_executing. (closes #406
diff --git a/src/version.c b/src/version.c
index 6279847..70a43d5 100644
--- a/src/version.c
+++ b/src/version.c
@@ -780,6 +780,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    995,
+/**/
     994,
 /**/
     993,