Issue #29157: getrandom() is now preferred over getentropy()

The glibc now implements getentropy() on Linux using the getrandom() syscall.
But getentropy() doesn't support non-blocking mode.

Since getrandom() is tried first, it's not more needed to explicitly exclude
getentropy() on Solaris. Replace:

    if defined(HAVE_GETENTROPY) && !defined(sun)

with

    if defined(HAVE_GETENTROPY)
1 file changed