[patch] Backport C++ Filesystem TS fixes to gcc-5-branch

[Jonathan Wakely]

Since I backported the Filesystem lib to the gcc-5-branch in
mid-August there have been some bugfixes on trunk, and dual ABI
support in libstdc++fs.a, so I'm backporting those changes to the
branch too.

This also removes some empty TODO files I accidentally added on the
branch, which were only meant to be in my local tree not checked in!

Tested powerpc64le-linux, committed to gcc-5-branch.


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