[llvm-dev] llvm-config --cxxflags should report C++ language standard version

[Johan Engelen via llvm-dev]

Hi all,
  Since  2724d9e12960cc1d93eeabbfc9aa1bffffa041cc, llvm-config -cxxflags no
longer reports the C++ language standard version (e.g. "-std=c++14") used
to compile LLVM. This may break builds of projects that build with the same
flags as LLVM, e.g. the LDC compiler.
Quoting from llvm/tools/llvm-config/CMakeLists.txt:
```
# The language standard potentially affects the ABI/API of LLVM, so we want
# to make sure it is reported by llvm-config.
```
Even in the case of default C++ version, in my opinion llvm-config should
explicitly report it.

cheers,
  Johan
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