iconv prototype

[Eric Blake]

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Per POSIX, iconv's inbuf argument is non-const (even though an
implementation would be stupid to modify it); this is probably historical
baggage.  At any rate, ok to apply this?  I intentionally did not modify
_iconv_r, where we can use the const without standards issues.

2009-08-20  Eric Blake  <ebb9@byu.net>

	* libc/include/iconv.h (iconv): Match POSIX prototype.
	* libc/iconv/lib/iconv.c (iconv): Likewise.

- --
Don't work too hard, make some time for fun as well!

Eric Blake             ebb9@byu.net
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