Log Message:
Update to 1.9732

Upstream changes:
1.9732 [2016-03-13]
  - MUTEX_LOCK, not PERL_MUTEX_LOCK: blead e5b02b5d
  - also hrt_ualarm_itimer() is unused: 1cb6cce3
  - the mutex needs init: 2d639e20
  - version bump to 1.9732: 730d7fdc

1.9731 [2016-03-13]
  - mark unused variable as such: blead a914236c
  - OS X emulation mutex accidentally unused: da7a6455
  - remove hrt_ualarm: 6da77c36
  - pod error fixes: 919ca095
  - nanosleep and clock_nanosleep cleanups: c8ea02b8..e3ff671b
  - static funcs in HiRes.xs: 4e922c26
  - Remove unused variable: 52ffb1b5

1.9730 [2016-02-17]
  - TIME_HIRES_DONT_RUN_PROBES=1 to build the probes but not run them
    [rt.cpan.org #111391]

1.9729 [2016-02-13]
  - new constants
    [rt.cpan.org #111170]
  - clock_getres(), clock_gettime(), clock_nanosleep() emulation for OS X
    [rt.cpan.org #78566]