safe-ctype.h (HC_UNKNOWN, [...]): Rename to HOST_CHARSET_UNKNOWN...

include:
	* safe-ctype.h (HC_UNKNOWN, HC_ASCII, HC_EBCDIC): Rename to
	HOST_CHARSET_UNKNOWN, HOST_CHARSET_ASCII, HOST_CHARSET_EBCDIC
	respectively.
libiberty:
	* safe-ctype.c: Use HOST_CHARSET_ASCII and HOST_CHARSET_EBCDIC,
	not HC_ASCII and HC_EBCDIC.
	Add documentation in form expected by gather-docs.
	* hex.c: Use HOST_CHARSET, not hand-coded check of character set.
	* Makefile.in, functions.texi: Regenerate.
gcc:
	* config/i370/i370.c, config/i370/i370.h: Use HOST_CHARSET_ASCII
	and HOST_CHARSET_EBCDIC, not HC_ASCII and HC_EBCDIC.

From-SVN: r68335