Allow users to set CPPFLAGS and CXXFLAGS on the make command line.

Tested: make CPPFLAGS=-m64 CXXFLAGS=-m64 -j8 && (cd tools/clang;make test)


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@98399 91177308-0d34-0410-b5e6-96231b3b80d8
12 files changed