package/x11r7/xdriver_xf86-video-r128: switch dependency from mesa3d to libgl

DRI support for this driver is provided by the xserver_xorg-server
package when BR2_PACKAGE_HAS_LIBGL is enabled:
https://git.busybox.net/buildroot/tree/package/x11r7/xserver_xorg-server/xserver_xorg-server.mk#n91

Change the dependency to follow the logic of xserver_xorg-server.

Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>

package/x11r7/xdriver_xf86-video-r128/xdriver_xf86-video-r128.mk

@@ -11,7 +11,9 @@ XDRIVER_XF86_VIDEO_R128_LICENSE = MIT
 XDRIVER_XF86_VIDEO_R128_LICENSE_FILES = COPYING
 XDRIVER_XF86_VIDEO_R128_DEPENDENCIES = xserver_xorg-server xorgproto
 
-ifeq ($(BR2_PACKAGE_MESA3D_DRI_DRIVER),)
+ifeq ($(BR2_PACKAGE_HAS_LIBGL),y)
+XDRIVER_XF86_VIDEO_R128_CONF_OPTS += --enable-dri
+else
 XDRIVER_XF86_VIDEO_R128_CONF_OPTS += --disable-dri
 endif