package/x11r7/xdriver_xf86-video-sis: 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.

Build-tested using these defconfigs:

BR2_PACKAGE_MESA3D=y
BR2_PACKAGE_MESA3D_GALLIUM_DRIVER_SWRAST=y
BR2_PACKAGE_MESA3D_OPENGL_GLX=y
BR2_PACKAGE_XORG7=y
BR2_PACKAGE_XSERVER_XORG_SERVER=y
BR2_PACKAGE_XDRIVER_XF86_VIDEO_SIS=y

and

BR2_PACKAGE_XORG7=y
BR2_PACKAGE_XSERVER_XORG_SERVER=y
BR2_PACKAGE_XDRIVER_XF86_VIDEO_SIS=y

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-sis/Config.in

@@ -1,10 +1,6 @@
 config BR2_PACKAGE_XDRIVER_XF86_VIDEO_SIS
 	bool "xf86-video-sis"
-	depends on BR2_PACKAGE_MESA3D
 	select BR2_PACKAGE_LIBDRM
 	select BR2_PACKAGE_XORGPROTO
 	help
 	  SiS and XGI video driver
-
-comment "xf86-video-sis needs mesa3d"
-	depends on !BR2_PACKAGE_MESA3D

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

@@ -11,7 +11,9 @@ XDRIVER_XF86_VIDEO_SIS_LICENSE = MIT
 XDRIVER_XF86_VIDEO_SIS_LICENSE_FILES = COPYING
 XDRIVER_XF86_VIDEO_SIS_DEPENDENCIES = xserver_xorg-server libdrm xorgproto
 
-ifeq ($(BR2_PACKAGE_MESA3D_DRI_DRIVER),)
+ifeq ($(BR2_PACKAGE_HAS_LIBGL),y)
+XDRIVER_XF86_VIDEO_SIS_CONF_OPTS += --enable-dri
+else
 XDRIVER_XF86_VIDEO_SIS_CONF_OPTS += --disable-dri
 endif