xorg-proto-common: set UNKNOWN_CONFIGURE_WHITELIST
This include adds configure options globally but not all X libraries support
them, so to avoid unknown-configure-option warnings add them to the whitelist.
Also change the options from --enable-foo=no to --disable-foo as they're clearer
and the whitelist would have to contain --enable-foo.
Signed-off-by: Ross Burton <ross.burton@intel.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
