llvm-config: Use build_mode instead of LLVM_BUILDMODE. It should be equivalent in MakefileStyle.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@197817 91177308-0d34-0410-b5e6-96231b3b80d8
llvm-config: Show OBJROOT rather than OBJROOT/BUILD_MODE in MakefileStyle.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@197818 91177308-0d34-0410-b5e6-96231b3b80d8
Fix yet another typo

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@197821 91177308-0d34-0410-b5e6-96231b3b80d8