First cut at supporting simulators in gdbserver:

First cut at supporting simulators in gdbserver:

	* configure, configure.in: Allow gdbserver to be configured
	for cross-target environments.
	* gdbserver/Makefile.in: Add simulator support.
	* gdbserver/configure.in: Eliminate assumption that host == target.
	Simplify using gdb/configure.tgt and gdb/configure.host.
	Fix other minor configuration errors.
	* gdbserver/low-sparc.c: Fix compile error.
	* gdbserver/remote-utils.c: Eliminate assumption that registers
	and addresses are four bytes.  Fix minor compile errors and warnings.
	* gdbserver/server.c: Rewrite numerous instances of identical code
	for starting inferior processes to call new function start_inferior.
	Eliminate assumption that registers and addresses are four bytes.
	* gdbserver/server.h: Add missing prototypes to eliminate compiler
	warnings.
	* gdbserver/low-sim.c: New file to mate gdbserver with simulators.
	* config/mips/vr5000.mt: Add Vr5000 simulator support to gdbserver.
	* config/i386/linux.mh: Eliminate gdbserver support as a first step
	in moving such support from host to target makefile fragments.
	* config/i386/linux.mt: Move gdbserver support here from linux.mh.