use .In rather than .Fd #include

do not use .St -p1003.1d-99 which is used in exactly two pages;
im going to delete support for it from mandoc(1)

Add support for the _POSIX_CPUTIME and _POSIX_THREAD_CPUTIME options,
including CLOCK_{PROCESS,THREAD}_CPUTIME_ID constants and
{clock,pthread}_getcpuclockid() functions.

Worked out at t2k13 with he

Add support for the _POSIX_CPUTIME and _POSIX_THREAD_CPUTIME options,
including CLOCK_{PROCESS,THREAD}_CPUTIME_ID constants and
{clock,pthread}_getcpuclockid() functions.

Worked out at t2k13 with help from tedu@ and matthew@ and testing by aja@
ok matthew@

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