Re: (ITS#8590) LMDB: Suppress SIGPIPE in mdb_env_copythr on OS X

[lmb]

I've created a test program, available at [1], which will hopefully
help verify this patch.

1: 
https://gist.github.com/lmb/a35e7b9566fa79e7bf971ac21bbb9efb#file-0002-add-tests-for-sigpipe-behaviour-patch

Best,
Lorenz