patch 7.4.1784

Problem:    The termtruecolor feature is enabled differently from many other
            features.
Solution:   Enable the termtruecolor feature for the big build, not through
            configure.

src/version.c

@@ -753,6 +753,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1784,
 /**/
     1783,
 /**/