remove duplicate isl_map_fast_is_fixed declaration
remove duplicate isl_map_fast_is_fixed declaration

Reported-by: Andreas Kloeckner <da2ea5bee82302925a2874f529684e980c179d70@informa.tiker.net>
Signed-off-by: Sven Verdoolaege <e5350bbed4977f5eb8ae1dc6abd9ae59d21ace75@kotnet.org>

epowers/isl,inducer/isl-mirror,evaautomation/isl,simbuerg/isl,BenzoSM/isl,cfx-next/toolchain_isl-upstream,Distrotech/isl,serge-sans-paille/isl,PollyLabs/isl,jleben/isl,nicolasvasilache/isl,Distrotech/isl,VanirLLVM/toolchain_isl,pierrotdelalune/isl,tobig/isl,serge-sans-paille/isl,jleben/isl,inducer/isl-mirror,BenzoSM/isl,SaberMod/isl-current,evaautomation/isl,jleben/isl,abduld/isl,simbuerg/isl,epowers/isl,crossbuild/isl,cfx-next/toolchain_isl-upstream,cfx-next/toolchain_isl-upstream,UBERTC/isl,UBERTC/isl,crossbuild/isl,pierrotdelalune/isl,Distrotech/isl,evaautomation/isl,epowers/isl,epowers/isl,KangDroidSMProject/ISL,VanirLLVM/toolchain_isl,BenzoSM/isl,PollyLabs/isl,inducer/isl-mirror,VanirLLVM/toolchain_isl,BenzoSM/isl,serge-sans-paille/isl,VanirLLVM/toolchain_isl,PollyLabs/isl,tobig/isl,pierrotdelalune/isl,KangDroidSMProject/ISL,cfx-next/toolchain_isl-upstream,pierrotdelalune/isl,SaberMod/isl-current,evaautomation/isl,tobig/isl,serge-sans-paille/isl,Meinersbur/isl,Meinersbur/isl,nicolasvasilache/isl,inducer/isl-mirror,BobSaget-Mod/libisl,nicolasvasilache/isl,epowers/isl,crossbuild/isl,PollyLabs/isl,jleben/isl,pierrotdelalune/isl,Distrotech/isl,simbuerg/isl,PollyLabs/isl,abduld/isl,BenzoSM/isl,Meinersbur/isl,UBERTC/isl,UBERTC/isl,BobSaget-Mod/libisl,crossbuild/isl,serge-sans-paille/isl,VanirLLVM/toolchain_isl,KangDroidSMProject/ISL,KangDroidSMProject/ISL,tobig/isl,simbuerg/isl,SaberMod/isl-current,abduld/isl,Distrotech/isl,BobSaget-Mod/libisl,nicolasvasilache/isl,BobSaget-Mod/libisl,SaberMod/isl-current,inducer/isl-mirror,jleben/isl,cfx-next/toolchain_isl-upstream,abduld/isl,BobSaget-Mod/libisl,KangDroidSMProject/ISL,nicolasvasilache/isl,Meinersbur/isl,simbuerg/isl