* inflow.c: Remove unused includes of sys/param.h, etc.

	* inflow.c: Remove unused includes of sys/param.h, etc.

	* inflow.c, ser-unix.c, ser-go32.c, ser-tcp.c, serial.h,
	terminal.h: Move all the process group stuff back to inflow.c;
	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 redefine crap if HAVE_TERMIOS.