patch 8.1.0756: copy() does not make a copy of a Blob

Problem:    copy() does not make a copy of a Blob.
Solution:   Make a copy.
diff --git a/src/version.c b/src/version.c
index bb13765..6317a8e 100644
--- a/src/version.c
+++ b/src/version.c
@@ -796,6 +796,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    756,
+/**/
     755,
 /**/
     754,