* config/gdbserver.exp (gdbserver_gdb_load): Rename from gdb_load.
    	Remove downloading, guessing the host executable, the calls to
    	gdb_file_cmd and gdb_target_cmd, and "load" support.
    	(infer_host_exec): New function broken out from gdb_load.
    	(gdb_load): New wrapper for gdbserver_gdb_load.
    	* lib/mi-support.exp (mi_gdb_target_cmd): New function, based on
    	gdb_target_cmd.  Use -target-select.
    	(mi_gdb_file_cmd): New function, broken out from mi_gdb_load.
    	Download binaries to the host.  Clear last_mi_remote_file when
    	we load a new binary.
    	(mi_gdb_load): Call mi_gdb_file_cmd.  If gdbserver.exp is loaded,
    	call gdbserver_gdb_load and mi_gdb_target_cmd.