add clock id macros for a number of new(ish) Linux-specific clocks
arguably CLOCK_MONOTONIC should be redirected to CLOCK_BOOTTIME with a fallback for old kernels that don't support it, since Linux's CLOCK_BOOTTIME semantics seem to match the spirit of the POSIX requirements for CLOCK_MONOTONIC better than Linux's version of CLOCK_MONOTONIC does. however, this is a change that would require further discussion and research, so for now, I'm simply making them all available.
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