configure/Makefiles for TT: many fixups

Redo the way the main CDE libs are specified in configure.ac... The
current way could not work due to evaluation issues, and the fact that
variables like $srcdir and the like are only valid in Makefiles, not
configure.

Use @LIBNAME@ rather then $(LIBNAME) in Makefile.am files - this way
the location is always evaluated when it's run, not in configure -
which can't work for a variety of reasons.

Got some of the TT binaries to build.

Made a new include/cppfile.inc file that can be used to pre-process
files.  The downside is that currently you can only pre-process one
file at a time per Makefile.  Something more robust is needed, but at
least tt/bin/shell now builds.  Will need to come up with a better way.

cde/lib/tt/lib/Makefile.am

@@ -15,7 +15,7 @@ libtt_la_SOURCES =
 endif
 
 libtt_la_LIBADD = api/c/libapi.la api/dnd/libdnd.la db/libdb.la mp/libmp.la \
-		  tttk/libtttk.la
+		  util/libutil.la tttk/libtttk.la
 
 if SOLARIS
 libtt_la_LIBADD += -lnsl -lsocket -lintl -ldl -lc -lw