When combined with libxtrans!7, this allows CVE-2020-25697 to be mitigated by placing the AF_UNIX socket in a secure directory on the filesystem.
This enables HAVE_LAUNCHD unconditionally and deletes the configure switch. It also drops abstract socket support. This MR is sufficient for xcb, but libxtrans!7 is needed for Xlib.
Signed-off-by: Demi Marie Obenour demiobenour@gmail.com