pkg/archlinux: Add multilib package

Signed-off-by: Emil Velikov <emil.l.velikov@gmail.com>
Reviewed-by: Chad Versace <chad.versace@linux.intel.com>
cmake: add autodetection for waffle_has_egl, glx...

Silence the pkg_check_modules and check set the default
options depending on the packages found.

Error out if the user has selected an option and it's
requirements are not met.

v2:
 - Do not silence pkg_check_modules.
 - Explicitly list the failing requirements.

Signed-off-by: Emil Velikov <emil.l.velikov@gmail.com>
Reviewed-by: Chad Versace <chad.versace@linux.intel.com>