tar: Fix typo gnu_longlink #478

Job	Run time
build (bls, fedora-compat)	6m 21s
build (bls, arch)	5m 7s
build (bls, rhel9)	6m 17s
build (uki, fedora)	6m 28s
build (unified-secureboot, fedora)	7m 55s
build (unified, fedora)	7m 39s
build (bls, fedora)	7m 4s
build (uki, arch)	5m 49s
build (bls, rawhide)	6m 2s
build (bls, arch, xfs, none)	4m 39s
build (bls, arch, ext4, none)	6m 25s
	1h 9m 46s

Provide feedback