[xproc] refactored build to follow how other extensions work
[xproc] refactored build to follow how other extensions work

svn path=/trunk/eXist/; revision=12150

patczar/exist,ambs/exist,MjAbuz/exist,patczar/exist,shabanovd/exist,jensopetersen/exist,zwobit/exist,MjAbuz/exist,eXist-db/exist,kohsah/exist,dizzzz/exist,lcahlander/exist,joewiz/exist,opax/exist,wshager/exist,ambs/exist,dizzzz/exist,joewiz/exist,joewiz/exist,hungerburg/exist,eXist-db/exist,zwobit/exist,wolfgangmm/exist,dizzzz/exist,RemiKoutcherawy/exist,wolfgangmm/exist,opax/exist,adamretter/exist,RemiKoutcherawy/exist,ambs/exist,RemiKoutcherawy/exist,olvidalo/exist,kohsah/exist,jessealama/exist,lcahlander/exist,wshager/exist,zwobit/exist,windauer/exist,eXist-db/exist,RemiKoutcherawy/exist,hungerburg/exist,opax/exist,RemiKoutcherawy/exist,wolfgangmm/exist,olvidalo/exist,jessealama/exist,adamretter/exist,hungerburg/exist,patczar/exist,kohsah/exist,ljo/exist,ljo/exist,lcahlander/exist,adamretter/exist,eXist-db/exist,jessealama/exist,hungerburg/exist,shabanovd/exist,RemiKoutcherawy/exist,olvidalo/exist,zwobit/exist,joewiz/exist,ljo/exist,wolfgangmm/exist,windauer/exist,eXist-db/exist,ambs/exist,jensopetersen/exist,opax/exist,MjAbuz/exist,adamretter/exist,wshager/exist,adamretter/exist,jessealama/exist,patczar/exist,adamretter/exist,wshager/exist,wshager/exist,eXist-db/exist,windauer/exist,dizzzz/exist,zwobit/exist,lcahlander/exist,MjAbuz/exist,ljo/exist,MjAbuz/exist,windauer/exist,lcahlander/exist,dizzzz/exist,olvidalo/exist,jensopetersen/exist,ljo/exist,windauer/exist,olvidalo/exist,MjAbuz/exist,kohsah/exist,hungerburg/exist,jensopetersen/exist,opax/exist,joewiz/exist,patczar/exist,ambs/exist,dizzzz/exist,wolfgangmm/exist,kohsah/exist,shabanovd/exist,windauer/exist,wolfgangmm/exist,ljo/exist,jessealama/exist,jensopetersen/exist,jessealama/exist,shabanovd/exist,kohsah/exist,jensopetersen/exist,shabanovd/exist,lcahlander/exist,shabanovd/exist,ambs/exist,joewiz/exist,wshager/exist,zwobit/exist,patczar/exist