* inflow.c: Remove unused includes of sys/param.h and sys/types.h.

	* inflow.c: Remove unused includes of sys/param.h and sys/types.h.

	* inflow.c, ser-unix.c, ser-go32.c, ser-tcp.c, serial.h,
	terminal.h, fork-child.c, main.c, utils.c: Move all the process
	group stuff back to inflow.c and terminal.h; that's a better place
	for it and fixes problems with trying to get/set the process group
	of a tty we're doing remote debugging on.
	* terminal.h: Skip the redefines and includes if HAVE_TERMIOS.