Has never been converted to build in modular builds, so has been unusable
since X11R7.0 release in 2005.  All known platforms with TLI/XTI support
that X11R7 & later releases run on also have (and mostly prefer) BSD
socket support for their networking API.

Mostly performed via "unifdef -USTREAMSCONN", followed by manual cleanup.

Signed-off-by: Alan Coopersmith <alan.coopersmith@oracle.com>