patch 8.0.1526: no test using a screen dump yet

Problem:    No test using a screen dump yet.
Solution:   Add a test for C syntax highlighting.  Add helper functions.
diff --git a/src/version.c b/src/version.c
index 3bed185..9c869ca 100644
--- a/src/version.c
+++ b/src/version.c
@@ -772,6 +772,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1526,
+/**/
     1525,
 /**/
     1524,