x11-wm/compiz-plugins-extra: fix crashes when using animation

- source headers animation-internal.h (from x11-wm/compiz-plugins-main)
  and animationaddon.h (from x11-wm/compiz-plugins-extra) include
  compiz-animation.h which uses gnu89 inline semantics.
- x11-wm/compiz-plugins-main is built with -std=gnu89 whereas
  x11-wm/compiz-plugins-extra is not. This why main animations work
  properly whereas extra animations do not.

PR:		217731
Reported by:	andy@neu.net
Submitted by:	Samy Mahmoudi <samy.mahmoudi@gmail.com>
Approved by:	freebsd-ports@dan.me.uk (maintainer timeout)

x11-wm/compiz-plugins-extra/Makefile

@@ -3,7 +3,7 @@
 
 PORTNAME=	compiz-plugins-extra
 PORTVERSION=	0.8.8
-PORTREVISION=	3
+PORTREVISION=	4
 CATEGORIES=	x11-wm
 MASTER_SITES=	http://releases.compiz.org/${PORTVERSION}/
 
@@ -20,6 +20,7 @@ RUN_DEPENDS:=	${BUILD_DEPENDS}
 GNU_CONFIGURE=	yes
 USE_GL=		yes
 USES=		gettext gmake libtool:keepla pathfix pkgconfig tar:bzip2
+USE_CSTD=	gnu89
 USE_GNOME=	gconf2 intltool
 USE_XORG=	glproto
 USE_LDCONFIG=	yes