patch 7.4.751
Problem:    It is not obvious how to enable the address sanitizer.
Solution:   Add commented-out flags in the Makefile. (Dominique Pelle)
            Also add missing test targets.
diff --git a/src/version.c b/src/version.c
index 1ca7c5c..bfdf8b8 100644
--- a/src/version.c
+++ b/src/version.c
@@ -742,6 +742,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    751,
+/**/
     750,
 /**/
     749,