[patch] libstdc++/65754 missing exports for fstream constructors

[Jonathan Wakely]

This fixes a regression I introduced by not exporting some of the
fstream constructors (the C2 base object ones) when using the new
std::string. Sorry for not finding this myself before the RC.

All the recently-updated baseline_symbols.txt files need updating. I
did this with sed and sort, and verified that the x86_64-linux-gnu and
powerpc64-linux-gnu ones are identical (except for the TLS call_once
symbols) to the output of 'make new-abi-baseline'. I have not checked
the baselines for other arches, only inspected the diff visually.

This really needs to go on trunk and gcc-5-branch.
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