Use getentropy in splitmix_init on unix-like platforms

[phadej]

No description provided.

[kazu-yamamoto]

If glibc 2.24 or earlier, which does not provide getentropy(), is installed in Linux, the build fails.

[phadej]

According to the internet, glibc 2.24 was released 4 Aug 2016. That's roughly nine years ago. The oldest GHC the just released splitmix supports is GHC-8.6.5 released 23 April 2019. (GHC-8.6.1 is from september 2018).

TL;DR, if you run old glibc machine, don't upgrade splitmix. Upgrade your glibc first.

[kazu-yamamoto]

Make sense.
CentOS 7 does not allow any upgrades anymore.
This is good time to throw away it.
As workaround, I stay with the old splitmix for a while.

[AshleyYakeley]

Does this close #93 as well?

[phadej]

@AshleyYakeley I don't know.

[AshleyYakeley]

This PR is in splitmix-0.1.2, right? I'll try it out and let you know.

[phadej]

This PR is in splitmix-0.1.2, right?

Yes.

[AshleyYakeley]

This doesn't fix #93 because the problem there is that GHCJS can't find splitmix_init.