Also, restructure some of the dependencies in the lib/tt binaries. We
will link with libtt (which will include libtirpc as a dependency),
and XTOOLLIB - all the right X11 stuff without needing to add it to
every OS. Removed several uneeded OS specializations ("if LINUX",
etc) as a result.
Removed PORT_NOFORK define in favor of autotools vfork availablility
checking. Use vfork if present.
Got rid of getenv/putenv definitions in favor of including correct
system headers.
Use FD_CLOEXEC in fcntl() call rather than hardcoded '1'.
Added -lm check to configure so dtwm will build.
Renamed internal round() function to wmround() to fix warning about
redefinition of builtin.
Fixed missing backslash in Makefile.am that prevented half the sources
from building.
hyousatsu