package/x11r7/xserver_xorg-server: glamor depends on libgl

Fixes
http://autobuild.buildroot.net/results/1f6/1f6131c25738577afd8e097d126e8166cbcfcdd8/

Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/x11r7/xserver_xorg-server/xserver_xorg-server.mk

@@ -214,7 +214,7 @@ endif
 ifeq ($(BR2_PACKAGE_XPROTO_DRI3PROTO),y)
 XSERVER_XORG_SERVER_DEPENDENCIES += xlib_libxshmfence xproto_dri3proto
 XSERVER_XORG_SERVER_CONF_OPTS += --enable-dri3
-ifeq ($(BR2_PACKAGE_LIBEPOXY),y)
+ifeq ($(BR2_PACKAGE_HAS_LIBGL)$(BR2_PACKAGE_LIBEPOXY),yy)
 XSERVER_XORG_SERVER_DEPENDENCIES += libepoxy
 XSERVER_XORG_SERVER_CONF_OPTS += --enable-glamor
 endif