GCN, nvptx: Allow for "hosted" libstdc++ build

[Thomas Schwinge]

Hi!

As the first of a few patches to enable libstdc++ for GCN, nvptx targets,
and eventually for OpenACC, OpenMP offloading use, I intend to push the
attached 'GCN, nvptx: Allow for "hosted" libstdc++ build'.  Any
objections?  It's not exactly pretty, but gets the job done.  (..., and
some more fine-tuning is to follow later on.)


Grüße
 Thomas


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