[PATCH, newlib/ARM] Fix cpp invocation for C++ in nano spec

[Thomas Preudhomme]

Hi,

The changes in c028685518a261f6d0dab0d7ed15f9570ab9b3d0 to use
newlib-nano's include directory work for cc1 but not cc1plus. cc1plus
comes with its own cpp spec which does not have a name attached to it.

This patch uses the renaming trick on cpp_options instead of cpp, as
cpp_options is used both by cc1 and cc1plus.


Tested with a small C program including string.h. Preprocess annotations show 
that both when using -x c and -x c++ newlib'nano's newlib.h gets chosen.

Is this ok for master?

Best regards,

Thomas
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