properly add declaration of isl_multi_union_pw_aff_apply_pw_aff
properly add declaration of isl_multi_union_pw_aff_apply_pw_aff

Commit c8a17e34b1 (add isl_multi_union_pw_aff_apply_pw_aff,
Fri Oct 25 15:51:59 2013 +0200) introduced isl_multi_union_pw_aff_apply_pw_aff
as a public function, but failed to declare it properly,
adding a duplicate declaration of isl_multi_union_pw_aff_apply_multi_aff
instead.

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

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