[Clipart] clipart-authority-control.pl and propagate-metadata.pl patches

[Stephen Silver]

During the last release, dozens of files containing non-ASCII
characters in the metadata were corrupted by having the characters
converted to HTML entities.  SVG::Metadata has been fixed so that
this will no longer happen - however, what will now happen is that
the characters will be converted to Latin-1, which is just as bad
(though not the fault of SVG::Metadata).

The attached patches for clipart-authority-control.pl and
propagate-metadata.pl fix this by opening the SVG files in
UTF-8 mode.

-- 
Stephen Silver
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