[xml] html push parser and libiconv

[Chris Anderson <christop charm net>]

I'm currently using an alternate entry point for
htmlCreatePushParserCtxt() that takes a string encoding name instead of
an xmlCharEncoding enumerator.  This is useful when a weird document
character encoding is returned in the HTTP headers that libiconv knows
about.  I attached my patch files in case there is interest in adding an
API entry point for this.  Patching libxml2-2.5.11 works ok.

Attachment: HTMLparser.c.patch
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Attachment: HTMLparser.h.patch
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Attachment: xmlIO.c.patch
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Attachment: xmlIO.h.patch
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