x86: avoid SORT_BY_INIT_PRIORITY with old GNU ld

x86: avoid SORT_BY_INIT_PRIORITY with old GNU ld

Support for this construct was added in 2.22 only. Avoid the need to
introduce logic to probe for linker script capabilities by (ab)using the
probe for a command line option having appeared at about the same time.

Note that this remains x86-specific because Arm is unaffected, by
requiring GNU ld 2.24 or newer.

Fixes: 4b7fd8153ddf ("x86: fold sections in final binaries")
Signed-off-by: Jan Beulich <jbeulich@suse.com>
Reviewed-by: Roger Pau Monné <roger.pau@citrix.com>