BaseTools CLANG35: use -target in PP flags as well

BaseTools CLANG35: use -target in PP flags as well

The Clang preprocessor may rely on builtin defines that are target
dependent, so we should add the -target argument also when invoking
the preprocessor directly.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Reviewed-by: Liming Gao <liming.gao@intel.com>
Reviewed-by: Leif Lindholm <leif.lindholm@linaro.org>
git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@19584 6f19259b-4bc3-4df7-8a09-765794883524