build: remove svn.externals (not needed with git)
build: remove svn.externals (not needed with git)

keijokapp/digidoc4j,open-eid/digidoc4j,fazz/digidoc4j,antonioaraujob/digidoc4j,keijokapp/digidoc4j,fazz/digidoc4j,antonioaraujob/digidoc4j,open-eid/digidoc4j,open-eid/digidoc4j