mot3300.h (ADD_MISSING_POSIX, [...]): Define to ensure all prototypes necessary for building libio will be available.

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	* m68k/mot3300.h (ADD_MISSING_POSIX, ADD_MISSING_XOPEN): Define to
	ensure all prototypes necessary for building libio will be available.
	* m68k/xm-mot3300.h (ADD_MISSING_POSIX, ADD_MISSING_XOPEN): Remove
	definitions here as they are not host specific.
	* m88k/sysv3.h, m88k/xm-sysv3.h: Likewise.

From-SVN: r24638