Replace obsolete AM_CONFIG_HEADER with AC_CONFIG_HEADERS
Replace obsolete AM_CONFIG_HEADER with AC_CONFIG_HEADERS

Signed-off-by: Gaetan Nadon <8a8cc541338200f67d4d0bcb65c78b6166649462@videotron.ca>
Signed-off-by: Dave Airlie <f2295d84e358395675bc8031be58672073ae065e@redhat.com>

patjak/xf86-video-gma500,patjak/xf86-video-gma500,wzyy2/xf86-video-modesetting,wzyy2/xf86-video-modesetting