Unify timer code
Remove the timer and TSC additional input code and instead provide a single routine that attempts to use the "best" timer/counter available on the system. It attempts to use TSC, then various OS dependent resources and finally several tries to obtain the date. If any of these timer/counters is successful, the rest are skipped. No randomness is credited for this. Reviewed-by: NRichard Levitte <levitte@openssl.org> Reviewed-by: NMatthias St. Pierre <Matthias.St.Pierre@ncp-e.com> (Merged from https://github.com/openssl/openssl/pull/5231)
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