Fixing xinclude test on Linux.
Fixing xinclude test on Linux.

xml4r/libxml-ruby,sferik/libxml-ruby,sferik/libxml-ruby,xml4r/libxml-ruby,sferik/libxml-ruby,xml4r/libxml-ruby,sferik/libxml-ruby,sferik/libxml-ruby,sferik/libxml-ruby,increments/libxml-ruby,increments/libxml-ruby,increments/libxml-ruby