This change avoids undesirably passing some internal file descriptors to a
process created (fork+exec) by another thread.
Kernel support for SOCK_CLOEXEC was added in r248534, March 19, 2013.
technique) so that we don't wind up calling into an application's
version if the application defines them.
Inspired by: qpopper's interfering and buggy version of strlcpy
Only warnings that could be fixed without changing the generated object
code and without restructuring the source code have been handled.
Reviewed by: /sbin/md5
