patch 7.4.1918

Problem:    Not enough testing for parsing viminfo lines.
Solution:   Add test with viminfo lines in bad syntax.  Fix memory leak.

src/version.c

@@ -753,6 +753,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1918,
 /**/
     1917,
 /**/