link.xq test module breaks ZORBA_NO_XMLSCHEMA

[Chris Hillery]

The module contains a function that uses Xerces, which is not available when compiling with ZORBA_NO_XMLSCHEMA. The minimum change would be to put the DECLARE_ZORBA_MODULE() inside IF(NOT ZORBA_NO_XMLSCHEMA).

Alternately, we could change the module to use some other library. It uses Xerces because it's testing the situation where a module library links against a library that libzorba also links against. Xerces was a bad choice since it's an optional dependency. Changing the test to use, say, libxml would be a better fix.

[Chris Hillery (ceejatec)]

The minimum change of not declaring this module if ZORBA_NO_XMLSCHEMA is defined has been done on the trunk and in 2.0.1. I'm not marking this as "fixed" yet since I think the second solution would be better going forward.