U555 - solaris compilation bits

- If you have Gnome installed on solaris, the GETRES support wouldn't build.
I don't have access to a solaris system with Gnome installed, but hacked
unixconf.h to force the GETRES code itself to be compiled.  So, I believe the
unixres.c change will work for folks really using Gnome on Solaris.
Whether the rest of the gnome code will build there is beyond me.
- I accidentally left TIMED_DELAY defined and the Solaris build failed.
While solaris has usleep(), this is not part of SVR4 as far as I can tell.
But, SysV does have poll, so I implemented msleep() for SysV systems in
terms of poll.  So, you can now define TIMED_DELAY on any SYSV build.

include/extern.h

@@ -2070,6 +2070,9 @@ E void VDECL(error, (const char *,...)) PRINTF_F(1,2);
 #ifdef UNIX
 E void NDECL(getlock);
 E void FDECL(regularize, (char *));
+# if defined(TIMED_DELAY) && !defined(msleep) && defined(SYSV)
+E void FDECL(msleep, (unsigned));
+# endif
 # ifdef SHELL
 E int NDECL(dosh);
 # endif /* SHELL */