[patch] Document resolved DRs in libstdc++ manual

[Jonathan Wakely]

This replaces our local copies of the LWG issues lists with the latest
revisions (from http://www.open-std.org/jtc1/sc22/wg21/docs/lwg93.zip)
and updates
https://gcc.gnu.org/onlinedocs/libstdc++/manual/bugs.html#manual.intro.status.bugs.iso
to document some of the DRs we've implemented in the last few years.

Committed to trunk.

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