* Makefile.in: Use $(objdir)/tcl and $(objdir)/tk if they are

	* Makefile.in:  Use $(objdir)/tcl and $(objdir)/tk if they are
	available.
	* configure.in (ENABLE_CLIBS):  Use $(TCL) and $(TK) instead of
	-ltcl and -ltk.
	* gdbtk.c:  Get rid of lots of unnecessary #includes.
	* (gdbtk_init):  Use ConnectionNumber macro instead of referencing
	Display structure directly.
	* gdbtk.tcl:  Change exit button to quit button (makes shebs
	happy).