Add a XML2_CONFIG environment variable for cross-compiling #2050
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Currently, xml2-config is called out with no way to define an xml2-config path.
This causes uwsgi to use the host xml2-config which will cause the xml2 library
and CFlag directories to point to the host instead of the cross-environment.
Add a check for the XML2_CONFIG environment variable, and if it exists, use
the resulting path instead.