Avoid allocation in _Wikitext_append_sanitized_link_target
Avoid allocation in _Wikitext_append_sanitized_link_target

Rather than allocating a buffer and then copying (appending) to
the output buffer, append directly to the output buffer along the
way.

At the same time, drop the now unneeded dest_ptr parameter to the
_Wikitext_utf8_to_utf32 function.

Signed-off-by: Wincent Colaiuta <c76ac2e9cd86441713c7dfae92c451f3e6d17fdc@wincent.com>

barnaclebarnes/wikitext,barnaclebarnes/wikitext,geni/wikitext,geni/wikitext,geni/wikitext,wincent/wikitext,barnaclebarnes/wikitext,wincent/wikitext