Revert "Introduce xcb_wait_for_event_until, for consuming responses in wire-order."

Revert "Introduce xcb_wait_for_event_until, for consuming responses in wire-order."

This function was intended to allow libX11 to fix a multi-threaded hang,
but the corresponding libX11 patch caused single-threaded apps to spin
sometimes. Since I've retracted that patch, this patch has no users and
shouldn't go into a release unless/until that changes.

This reverts commit 2415c11dec5e5adb0c17f98aa52fbb371a4f8f23.

Conflicts:

	src/xcb.h
	src/xcb_in.c

Signed-off-by: Jamey Sharp <jamey@minilop.net>