modesetting: Make ms_crtc_on non-static.

I want to use this in present.c.

Reviewed-by: Dave Airlie <airlied@redhat.com>
Reviewed-by: Eric Anholt <eric@anholt.net>
Signed-off-by: Kenneth Graunke <kenneth@whitecape.org>

hw/xfree86/drivers/modesetting/driver.h

@@ -118,6 +118,8 @@ void ms_drm_abort(ScrnInfoPtr scrn,
                   Bool (*match)(void *data, void *match_data),
                   void *match_data);
 
+Bool ms_crtc_on(xf86CrtcPtr crtc);
+
 xf86CrtcPtr ms_dri2_crtc_covering_drawable(DrawablePtr pDraw);
 xf86CrtcPtr ms_covering_crtc(ScrnInfoPtr scrn, BoxPtr box,
                              xf86CrtcPtr desired, BoxPtr crtc_box_ret);

hw/xfree86/drivers/modesetting/vblank.c

@@ -88,7 +88,7 @@ static int ms_box_area(BoxPtr box)
     return (int)(box->x2 - box->x1) * (int)(box->y2 - box->y1);
 }
 
-static Bool
+Bool
 ms_crtc_on(xf86CrtcPtr crtc)
 {
     drmmode_crtc_private_ptr drmmode_crtc = crtc->driver_private;