[gnome-builder] clang: allow clang plugin to be activated in c++ header files

[Christian Hergert <chergert src gnome org>]

commit 412b4c8d8b1bc78bee54d8ca052a54c546827a0f
Author: Christian Hergert <chergert redhat com>
Date:   Wed Jun 8 11:38:23 2016 -0700

    clang: allow clang plugin to be activated in c++ header files
    
    https://bugzilla.gnome.org/show_bug.cgi?id=767416

 plugins/clang/clang.plugin |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/plugins/clang/clang.plugin b/plugins/clang/clang.plugin
index c6d1586..f63cccb 100644
--- a/plugins/clang/clang.plugin
+++ b/plugins/clang/clang.plugin
@@ -6,7 +6,7 @@ Authors=Christian Hergert <christian hergert me>
 Copyright=Copyright © 2015 Christian Hergert
 Builtin=true
 Hidden=true
-X-Completion-Provider-Languages=c,chdr,cpp
+X-Completion-Provider-Languages=c,chdr,cpp,cpphdr
 X-Highlighter-Languages=c,chdr,cpp
 X-Highlighter-Languages-Priority=100
 X-Symbol-Resolver-Languages=c,chdr,cpp