Revert "[CMake] Pass Clang defaults to runtimes builds"

This reverts commit r332923 which is no longer needed since its
use has been reverted in r337033.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@337039 91177308-0d34-0410-b5e6-96231b3b80d8

Author: petrhosek

runtimes/CMakeLists.txt

@@ -227,7 +227,6 @@ else() # if this is included from LLVM's CMake
                                         -DCMAKE_C_COMPILER_WORKS=ON
                                         -DCMAKE_ASM_COMPILER_WORKS=ON
                              PASSTHROUGH_PREFIXES COMPILER_RT
-                                                  CLANG_DEFAULT
                              USE_TOOLCHAIN
                              ${EXTRA_ARGS})
   endfunction()
@@ -261,7 +260,6 @@ else() # if this is included from LLVM's CMake
                                         -DCMAKE_ASM_COMPILER_WORKS=ON
                                         -DCOMPILER_RT_DEFAULT_TARGET_ONLY=ON
                                         ${${target}_extra_args}
-                             PASSTHROUGH_PREFIXES CLANG_DEFAULT
                              TOOLCHAIN_TOOLS clang lld llvm-ar llvm-ranlib llvm-nm llvm-objcopy llvm-objdump llvm-strip
                              USE_TOOLCHAIN
                              ${EXTRA_ARGS})
@@ -357,7 +355,6 @@ else() # if this is included from LLVM's CMake
                                         -DCMAKE_CXX_COMPILER_WORKS=ON
                                         -DCMAKE_ASM_COMPILER_WORKS=ON
                              PASSTHROUGH_PREFIXES LLVM_ENABLE_RUNTIMES
-                                                  CLANG_DEFAULT
                                                   ${ARG_PREFIXES}
                              EXTRA_TARGETS ${extra_targets}
                                            ${test_targets}
@@ -446,7 +443,6 @@ else() # if this is included from LLVM's CMake
                                         -DLLVM_RUNTIMES_TARGET=${name}
                                         ${${name}_extra_args}
                              PASSTHROUGH_PREFIXES LLVM_ENABLE_RUNTIMES
-                                                  CLANG_DEFAULT
                              TOOLCHAIN_TOOLS clang lld llvm-ar llvm-ranlib llvm-nm llvm-objcopy llvm-objdump llvm-strip
                              EXTRA_TARGETS ${${name}_extra_targets}
                                            ${${name}_test_targets}