[mutter] Really install region.h as private header

[Tomas Frydrych <tomasf src gnome org>]

commit 1024eae742b9ba2a2a67b4022461239d5f8a11a8
Author: Rob Staudinger <robsta linux intel com>
Date:   Fri Aug 27 10:15:22 2010 +0200

    Really install region.h as private header
    
    Libmutter-private's preview-widget.h depends on region.h, so that one
    needs to be installed as well in order to keep dependees build.
    
    Signed-off-by: Tomas Frydrych <tf linux intel com>

 src/Makefile.am |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/src/Makefile.am b/src/Makefile.am
index 1ff4417..9cddc8f 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -181,7 +181,8 @@ libmutterinclude_base_headers =		\
 # atomnames.h: macros cause problems for scanning process
 libmutterinclude_extra_headers =		\
 	ui/preview-widget.h			\
-	include/atomnames.h
+	include/atomnames.h			\
+	include/region.h
 
 libmutterinclude_HEADERS =			\
 	$(libmutterinclude_base_headers)	\