egl/x11: Send invalidate to driver on copy_region path in swap_buffer

egl/x11: Send invalidate to driver on copy_region path in swap_buffer

Similar to swap_available path send invalidate to the driver because
egl/X11 is not watching for for server's invalidate events. The
dri2_copy_region path is trigerred when server supports DRI2 version
minor 1.

Tested with piglit egl tests for regression.

V2: Move invalidate from dri2_copy_region to swap_buffer common.

Cc: <mesa-stable@lists.freedesktop.org>
Signed-off-by: Deepak Rawat <drawat@vmware.com>
Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com>
Acked-by: Michel Dänzer <michel.daenzer@amd.com>