isl_map_deltas: don't copy flags from input
isl_map_deltas: don't copy flags from input

The deltas sets of disjoint relations may not be disjoint
and the entire result will not be normalized.

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

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