* defs.h (UINT_MAX, LONG_MAX, INT_MAX, INT_MIN): Replace hex

	* defs.h (UINT_MAX, LONG_MAX, INT_MAX, INT_MIN):  Replace hex
	constants with slightly more portable definitions (still depends
	on 2's complement arithmetic though).
	* config/i386/nm-linux.h:  Define NO_SYS_REG_H for no <sys/reg.h>.
	* i386v-nat.c (sys/reg.h):  Conditionalize include on
	NO_SYS_REG_H.  Linux doesn't have <sys/reg.h>.
	* ser-unix.c (termio.h):  Include <termio.h> like other files that
	include termio.h, not <sys/termio.h> which may not exist (on
	linux for example).