[PATCH] Link static C++ tests against libatomic.a if needed

[H.J. Lu]

Define cxx-static-link-libatomic to -latomic if DT_NEEDED entries in
libstdc++.so include libatomic.so.  Update link-extra-libs-static to
include $(cxx-static-link-libatomic) if -lstdc++ is used.

Tested with sparcv8-linux-gnu-leon3 and sparcv9-linux-gnu using
uild-many-glibcs.py.  This fixes BZ #34121.

-- 
H.J.
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