[patch] libstdc++/68276 and libstdc++68995 qualification in <functional>

[Jonathan Wakely]

Two patches to add missing std:: qualification to prevent ADL
problems. Both are regressions, 68276 only on trunk, but 68995 has
been broken since 4.8.0 (but only affects people mixing TR1 with
C++11, and I was already rude about them in Bugzilla so won't do it
again here ;-)

Tested powerpc64le-linux, committed to trunk.

I'll apply the 68995 fix to the branches too.

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