process: remove undocumented `now` argument from emitWarning()
process.emitWarning() "now" option is undocumented and a Boolean trap. Remove it before people start adopting it.
We only need it in one place internally. Replace it with an internal-only emitWarningSync() function.
Checklist
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make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
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