isl_basic_map_identity: inline basic_map_identity
isl_basic_map_identity: inline basic_map_identity

The need for a separate basic_map_identity was removed
in isl-0.14.1-459-gce1485e0f6 (drop *_like functions,
Sun Apr 26 13:18:03 2015 +0200).

Signed-off-by: Sven Verdoolaege <235c10dd23b819f81cdc9756a251746bc184cab6@gmail.com>

Meinersbur/isl,Meinersbur/isl,Meinersbur/isl,Meinersbur/isl