Replace with sed as done elsewhere.
Fixes error with at least btrfs-progs:
Package '@LIBSELINUX@', required by 'mount', not found
Package '@LIBCRYPTSETUP@', required by 'mount', not foun
Signed-off-by: Rosen Penev <rosenp@gmail.com>
Signed-off-by: maurerr <mariusd84@gmail.com>