[libstdc++ patch] Fix ambiguity in calls to bind

[Douglas Gregor]

A recent change to mainline GCC exposed an ambiguity in function template 
partial ordering for tr1::bind. The compiler is right, so here's the 
"obvious" fix.

Tested i686-pc-linux-gnu on mainline; no regressions. Okay for mainline?
This will also be needed on the 4.0 branch. Assuming all tests pass there, 
okay for 4.0 branch?

 Doug

005-04-01  Douglas Gregor  <doug.gregor@gmail.com>

 * include/tr1/functional (_Maybe_wrap_member_pointer): Wrap up
 member pointers in _Mem_fn but let other function objects pass
 through unchanged.
 * include/tr1/functional_iterator (bind): Reduce number of bind()
 overloads to two to eliminate ambiguities. Use
 _Maybe_wrap_member_pointer to handle member pointers gracefully.
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