Makefile: use automake rule for compiling .S
Makefile: use automake rule for compiling .S

Automake seems to have its own rules for compiling an .o from an .S.
Essentially it does the same as our hand-crafted rule, but adds some
things like dependency file generation.

Remove our hand-crafted rule to use the automake rule, it is less
surprising.

http://www.gnu.org/software/automake/manual/html_node/Assembly-Support.html

Signed-off-by: Pekka Paalanen <0f6ae7001e34c37b02fb2c1c2573ddf8f442136a@collabora.co.uk>
Tested-by: Víctor Jáquez <853e0dbb5ddd43a0f0483f24794ae05c4c52af91@igalia.com>
Reviewed-by: Peter Hutterer <b9c50af7afa7642f6f854434cda9ffe54ece8b85@who-t.net>

sir-murray/wayland,mchalupa/wayland,sir-murray/wayland,mchalupa/wayland,sir-murray/wayland,mchalupa/wayland