patch 8.0.0080

Problem:    The OS X build fails on Travis.
Solution:   Skip the virtual framebuffer on OS X.

src/version.c

@@ -764,6 +764,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    80,
 /**/
     79,
 /**/