BZ #14991: Update BIG5-HKSCS charmap to HKSCS-2008

[Andreas Schwab]

I was able to find the URL of the HKSCS standard, so I could update all
the remaining characters, with no PUA assignments left.  Note that there
are now four characters that are mapped to combining character pairs in
Unicode, so that the conversion is now stateful.

Andreas.

	[BZ #14991]
	* charmaps/BIG5-HKSCS: Update to HKSCS-2008.

	* iconvdata/big5hkscs.c (big5hkscs_to_ucs, from_ucs4)
	(from_ucs4_idx): Regenerate.
	(MIN_NEEDED_FROM, MAX_NEEDED_FROM, MIN_NEEDED_TO): Remove macros.
	(FROM_LOOP_MIN_NEEDED_FROM, FROM_LOOP_MAX_NEEDED_FROM)
	(FROM_LOOP_MIN_NEEDED_TO, FROM_LOOP_MAX_NEEDED_TO)
	(TO_LOOP_MIN_NEEDED_FROM, TO_LOOP_MAX_NEEDED_FROM)
	(TO_LOOP_MIN_NEEDED_TO, TO_LOOP_MAX_NEEDED_TO, PREPARE_LOOP)
	(EXTRA_LOOP_ARGS, SAVE_RESET_STATE, EMIT_SHIFT_TO_INIT)
	(EXTRA_LOOP_DECLS, MAX_NEEDED_OUTPUT): New macros.
	(MIN_NEEDED_INPUT, MAX_NEEDED_INPUT, MIN_NEEDED_OUTPUT): Define
	from FROM_LOOP and TO_LOOP specific macros.
	(BODY): Handle combining characters.
	* iconvdata/BIG5HKSCS.irreversible: Update.
	* iconvdata/BIG5HKSCS.precomposed: New file.
	* iconvdata/testdata/BIG5HKSCS: Add all characters from range
	0x8740 - 0x87DF.
	* iconvdata/testdata/BIG5HKSCS..UTF8: Update.

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Andreas Schwab, SUSE Labs, schwab@suse.de
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"And now for something completely different."