Coverity: Assert side effect: CID 2

Coverity: Assert side effect: CID 2

	* src/extents.c (gap_array_delete_marker): Remove unnecessary
	volatile (we don't multithread so we should have this be
	interrupted. If at some point we make multi-threaded SXEmacs, this
	should be protected by some barrier.

	* src/extents.c (gap_array_delete_all_markers): Ditto.

Signed-off-by: Nelson Ferreira <nelson.ferreira@ieee.org>