Fix unresolved implicit dependency of c_ppline.st state on c.st

Patch by Ivan Chelubeev <ivan.chelubeev@gmail.com>
Slightly amended by Tim Retout <tim@retout.co.uk>

diff --git a/states/hl/c_ppline.st b/states/hl/c_ppline.st
index 2bde859..fec44d5 100644
--- a/states/hl/c_ppline.st
+++ b/states/hl/c_ppline.st
@@ -3,11 +3,10 @@
  * Objective-C highlighting rules.
  */
 
+require_state (c);
+
 state c_ppline extends CHighlight
 {
-  BEGIN {
-    require_state (c);
-  }
   /* Comments within a pre-processor line. */
   /\/\*/ {
     comment_face (true);
