This patch removes an unnecessary flag which was breaking the
build with older versions of the ISA-L library (v2.23 and older)
and replace with a more appropriate flag which is present
in older versions of library.
Fixes: bd03d3f1e4f1 ("compress/isal: enable checksum support")
Signed-off-by: Lee Daly <lee.daly@intel.com>
Tested-by: Harry van Haaren <harry.van.haaren@intel.com>