deprecate isl_map_n_*
deprecate isl_map_n_*

The motivation for deprecating isl_map_n_* is the same as that
for deprecating isl_basic_map_n_* in the previous commit.

Since these functions were never documented, there should be no
outside uses, or, if there are, they can easily be replaced
by calls to isl_map_dim.

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

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