* libxml2: fix the build
See #1917
* libxml2-python: Build with Python 3
* itstool: Build with Python 3
* libxslt: fix the build
See #1917
* libxslt: Drop libxslt-python
* yelp-xsl: Don't depend on libxslt-python
Doesn't look like it is used
* yelp-tools: Don't depend on libxslt-python
Doesn't seem to be used
* rarian: Don't depend on libxslt-python
libxslt seems enough
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