build: Stop putting FFI_CFLAGS in AM_CFLAGS
build: Stop putting FFI_CFLAGS in AM_CFLAGS

AM_CFLAGS are the defaults passed to anything that doesn't specify its own
_CFLAGS, so instead of putting FFI_CFLAGS there, let's just add that to
anything that actually needs it.

The only thing that needs it but didn't have it specifically was
libwayland_util (for connection.c)

Signed-off-by: Derek Foreman <2f97e0f0bc172406aab8ccd42dab54c95bab8759@osg.samsung.com>
Reviewed-by: Peter Hutterer <b9c50af7afa7642f6f854434cda9ffe54ece8b85@who-t.net>
Reviewed-by: Pekka Paalanen <0f6ae7001e34c37b02fb2c1c2573ddf8f442136a@collabora.co.uk>

mchalupa/wayland,tulcod/wayland,eyolfson/wayland,bitfactor/wayland,sir-murray/wayland,bitfactor/wayland,abooij/wayland,tulcod/wayland,eyolfson/wayland,abooij/wayland,abooij/wayland,mchalupa/wayland,sir-murray/wayland,sir-murray/wayland,eyolfson/wayland,tulcod/wayland,mchalupa/wayland,bitfactor/wayland