Do not install the new helpers macro header file.

Signed-off-by: Jon A. Cruz <jonc@osg.samsung.com>
Reviewed-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>

Makefile.am

@@ -190,7 +190,6 @@ westoninclude_HEADERS =				\
 	src/timeline-object.h			\
 	shared/matrix.h				\
 	shared/config-parser.h			\
-	shared/helpers.h			\
 	shared/zalloc.h				\
 	shared/platform.h