Edward Thomson 9324d16e73 cmake: standardize USE_THREADS and USE_NSEC ...

Threading can now be disabled with `USE_THREADS=OFF` instead of
`THREADSAFE=OFF` to better support the other cmake semantics.

Nanosecond support is the default _if_ we can detect it.  This should be
our default always - like threads - and people can opt out explicitly.

2021-11-11 15:56:10 -05:00

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