updated for version 7.4.577

Problem:    Matching with a virtual column has a lot of overhead on very long
            lines. (Issue 310)
Solution:   Bail out early if there can't be a match. (Christian Brabandt)
            Also check for CTRL-C at every position.

src/version.c

@@ -741,6 +741,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    577,
 /**/
     576,
 /**/