main/clang: fix packaging
Keep /usr/lib/clang/x.y.z/include in the main package as all these headers (altivec.h, msa.h, x86intrin.h etc) are required to build programs with clang, not against it.
Keep /usr/lib/clang/x.y.z/include in the main package as all these headers (altivec.h, msa.h, x86intrin.h etc) are required to build programs with clang, not against it.