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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: 4b7fd815

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