Richard Smith 0436ec2128 Permit __VA_OPT__ in all language modes and allow it to be detected with #ifdef. ...

These changes are intended to give code a path to move away from the GNU
,##__VA_ARGS__ extension, which is non-conforming in some situations and
which we'd like to disable in our conforming mode in those cases.

2021-01-27 12:34:43 -08:00

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