Re: master build broken [macOS]

[Paul Eggert]

Thanks for the fix; I installed it. GNU/Linux and Solaris <sys/socket.h> 
have SOCK_CLOEXEC and I didn't catch the typo for non-SOCK_CLOEXEC 
systems like macOS.

It is odd that even after all these years there's no way to create 
sockets in a thread-safe way on macOS. This doesn't matter for 
emacsclient but I assume it does matter for src/process.c.