Call remote_check_symbols even if only symbol-file (not file) has been given

Call remote_check_symbols even if only symbol-file (not file) has been given

The Eclipse "C/C++ GDB Hardware Debugging" plugin runs only the
"symbol-file" command.  In this case, remote_check_symbols is not
called and no qSymbol:: packet is sent to the server (OpenOCD in my
case).

gdb/
2014-02-04  Christian Eggers  <ceggers@gmx.de>  (tiny change)

	* remote.c (remote_start_remote): Call remote_check_symbols even
	if only symbol-file (not file) has been given.