[PATCH] Fix -Wsystem-header warnings in libstdc++

[Jonathan Wakely]

On 01/12/17 16:10 +0000, Jonathan Wakely wrote:
>On 01/12/17 15:11 +0000, Jonathan Wakely wrote:
>>This fixes a number of warnings that show up with -Wsystem-headers
>
>This fixes some more.

And some more, this time for -Wunused, -Wcomment, and
-Wvariadic-macros.

Tested powerpc64le-linux, committed to trunk.

The purpose of these is not only to reduce noise if users use
-Wsystem-headers, but to get us to a place where PR 50871 can be fixed
(i.e. build and test libstdc++ without having useful warnings
suppressed by the #pragma GCC system_header lines).

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