[patch] libstdc++/66078 __make_move_if_noexcept_iterator should return a constant iterator or a move iterator

[Jonathan Wakely]

As discussed in the thread starting at
https://gcc.gnu.org/ml/libstdc++/2014-05/msg00027.html when
__make_move_if_noexcept_iterator decides not to move it returns a
mutable iterator, which can then result in the wrong constructor being
used. This ensures that when not moving we will get a pointer-to-const
which will result in the copy constructor being called.

Tested powerpc64-linux, committed to trunk.
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