[PATCH] makepkg --packagelist: fix listing debug packages with makepkg.conf
print_all_package_names used in_opt_array to check whether or not the
PKGBUILD itself has options=('debug' 'split') -- while checking to see
if it was enabled per split package which doesn't make sense as these
options apply globally. This prevented debug packages from being listed
if enabled via makepkg.conf rather than per PKGBUILD.
Instead, use check_option to determine whether makepkg actually thinks
it is meant to try creating a split debug package.