Ruby

merge revision(s) 3e47e7a499acd256be549935fcb559d3c82e556c, 46e4c8673747de96838d2c5dec37446d23d99d88:

    Fix redefinition of `clock_gettime` and `clock_getres`

    winpthreads-git 12.0.0.r720 provides `clock_gettime` and
    `clock_getres` as inline functions.

    Detect `clock_gettime` and `clock_getres` for winpthreads