[gomp4] Lack of OpenACC NVPTX devices is not an error during scanning

[Julian Brown]

Hi,

This patch fixes an oversight whereby if the CUDA libraries are
available for some reason on a system that doesn't actually contain an
nVidia card, an OpenACC program will raise an error if the NVPTX
backend is picked as a default instead of falling back to some other
device instead.

OK for gomp4 branch? For trunk?

Thanks,

Julian

ChangeLog

    libgomp/
    * plugin/plugin-nvptx.c (nvptx_get_num_devices): Return zero
    on cuInit failure.
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