Reid Kleckner 61a66e4b5e Revert "Suppress non-conforming GNU paste extension in all standard-conforming modes" ...

This reverts commit f4537935dc.
This reverts commit b43c26d036.

This GNU and MSVC extension turns out to be very popular. Most projects
are not using C++20, so cannot use the new __VA_OPT__ feature to be
standards conformant. The other workaround, using -std=gnu*, enables too
many language extensions and isn't viable.

Until there is a way for users to get the behavior provided by the
`, ## __VA_ARGS__` extension in the -std=c++17 and earlier language
modes, we need to revert this.

2021-01-27 10:59:57 -08:00

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