hwloc pulls in clang

[Achim Gratz]

The recent (still un-announced) update of hwloc pulls in clang via a
dependency chain going through some OpenCL stuff.  Can this please be
reverted?  Personally I'd rather live without whatever functionality is
provided that way if that dependency cannot be made optional; also,
clang is unmaintained on Cygwin for quite a while, so adding that
dependency now seems wrong.


Regards,
Achim.
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