Fix termios bit macros.

Fix termios bit macros.

	Move *DLY definitions where they belong, in termios.h.
	Add *[0-3] definitions.
	Fixes confusion between VT and FF.
	* bits/ioctls.h (NL0, NL1, TAB0, TAB1, TAB2, CR0, CR1, CR2, CR3, FF0,
	FF1, BS0, BS1): Undefine these at start if they are already defined to
	avoid collision with termios.h.
	(NLDLY, TABDLY, TAB3, CRDLY, VTDLY, BSDLY): Remove macros.
	* bits/termios.h [__USE_MISC || __USE_XOPEN] (NL0, NL1, TAB0,
	TAB1, TAB2, CR0, CR1, CR2, CR3, FF0, FF1, BS0, BS1): Likewise.
	[__USE_BSD || __USE_XOPEN] (OCRNL, ONOCR, ONLRET): New macros.
	[__USE_MISC || __USE_XOPEN] (NLDLY, NL0, NL1, TABDLY, TAB0, TAB1, TAB2,
	TAB3, CRDLY, CR0, CR1, CR2, CR3, FFDLY, FF0, FF1, BSDLY, BS0, BS1,
	VTDLY, VT0, VT1): New macros.
	[__USE_GNU] (OLCUC): Change value of macro.
	[__USE_XOPEN] (OFILL): New macro.
	[__USE_BSD] (CRTSCTS): Change value.
	(CRTS_IFLOW, CCTS_OFLOW): Change into compatibility macros.
	[__USE_BSD] (CDTRCTS, CHWFLOW): New macros.
	(B7200, B14400, B28800, B76800): New macros.