[patch] libstdc++/57394 - copy operations for basic_streambuf

[Jonathan Wakely]

This patch isn't very useful on its own, but fixes the PR and should
be useful when adding move operations to the derived streambufs.

The mem-initializer for basic_streambuf::_M_out_end was initialized
from __sb._M_out_cur, which I assume was not intentional. Those
initializers were only added to keep -Weffc++ happy, see
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=12854#c7
It might make sense just to value-initialize all the members, we're
not expecting that copy constructor to ever get called in C++03 mode,
but I don't plan to change that.

The real commit also removes some trailing whitespace not shown in
this patch.

Tested x86_64-linux, committed to trunk.
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