patch 7.4.1712

Problem:    For plugins in packages, plugin authors need to take care of all
            dependencies.
Solution:   When loading "start" packages and for :packloadall, first add all
            directories to 'runtimepath' before sourcing plugins.

src/version.c

@@ -748,6 +748,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1712,
 /**/
     1711,
 /**/