configure.ac: drop -gsplit-dwarf from llvm-config --cxxflags output
configure.ac: drop -gsplit-dwarf from llvm-config --cxxflags output

Apparently, Ubuntu compiles clang with -gsplit-dwarf.
This results in -gsplit-dwarf appearing in the output of
llvm-config --cxxflags and subsequently causing *.dwo files
to be generated.  These do not get cleaned by "make mostlyclean" and
therefore cause "make distcheck" to fail.

Remove the flag from the llvm-config --cxxflags output
to avoid these files getting generated.

An alternative would be to clean up the files, by adding

MOSTLYCLEANFILES = $(extract_interface_OBJECTS:$(OBJEXT)=dwo)

to interface/Makefile.am.

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

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