Final patch for libstdc++ _M_open_mode and related

[Zack Weinberg]

The only change from the previous revision of this patch is, I put
back a typo fix in the test cases that was in the original but got
dropped out by mistake in the first revision.  Oh, and as requested
the baseline-symbols.txt changes are dropped from the 3.4 patch.
ChangeLogs remain the same, mostly.

Bootstrapped i686-linux, applied 3.4 and mainline.  Gaby, OK for 3.3
branch?

zw

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