isl_map_copy_basic_map: extract out internal map_copy_basic_map
isl_map_copy_basic_map: extract out internal map_copy_basic_map

This allows isl_map_copy_basic_map to be deprecated
without producing a warning on isl_set_copy_basic_set.

Signed-off-by: Sven Verdoolaege <e5350bbed4977f5eb8ae1dc6abd9ae59d21ace75@kotnet.org>

Meinersbur/isl,PollyLabs/isl,inducer/isl-mirror,nicolasvasilache/isl,inducer/isl-mirror,nicolasvasilache/isl,tobig/isl,tobig/isl,PollyLabs/isl,Meinersbur/isl,UBERTC/isl,Meinersbur/isl,UBERTC/isl,UBERTC/isl,PollyLabs/isl,inducer/isl-mirror,nicolasvasilache/isl,UBERTC/isl,PollyLabs/isl,nicolasvasilache/isl,inducer/isl-mirror,nicolasvasilache/isl,tobig/isl,PollyLabs/isl,Meinersbur/isl,tobig/isl,inducer/isl-mirror