message: Do not link avx512skx-i32x8 for LLVM before 8.0
diff: @@ -177,8 +177,11 @@ set (ISPC_TARGETS
  avx1-i32x8 avx1-i32x16 avx1-i64x4
  avx2-i32x4 avx2-i32x8 avx2-i32x16 avx2-i64x4
  avx512knl-i32x16
  - avx512skx-i32x8 avx512skx-i32x16
  + avx512skx-i32x16
  generic-1 generic-4 generic-8 generic-16 generic-32 generic-64)
  +if (${LLVM_VERSION_NUMBER} GREATER_EQUAL "8.0.0")
  + list(APPEND ISPC_TARGETS avx512skx-i32x8)
  +endif()
  set(CLANG_LIBRARY_LIST clangFrontend clangDriver clangSerialization clangParse clangSema clangAnalysis clangAST clangBasic clangEdit clangLex)
  set(LLVM_COMPONENTS engine ipo bitreader bitwriter instrumentation linker option)
  