xserver: remove unrecognised options

xserver: remove unrecognised options

--disable-xorgcfg was removed in 2008.

--with-fontdir was renamed to --with-fontrootdir in 2009 and the default value
is good.

--disable-xf86misc was removed in 2008.

--disable-acfb, -ccfb and -mcfb should have been --disable-afb, -cfb, -mfb, and
were removed in 2008.

Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>