patch 8.0.0786: build failures on Travis

Problem:    Build failures on Travis.
Solution:   Go back to precise termporarily.  Disable coverage with clang.

Author: brammool

src/version.c

@@ -769,6 +769,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    786,
 /**/
     785,
 /**/