PDFBOX-464: adding lib.dir to build.xml, deleting external folder from svn
PDFBOX-464: adding lib.dir to build.xml, deleting external folder from svn

git-svn-id: 73746072a361c8027bb2177f17128911b05b2bab@812000 13f79535-47bb-0310-9956-ffa450edef68

veraPDF/veraPDF-pdfbox,BezrukovM/veraPDF-pdfbox,benmccann/pdfbox,mathieufortin01/pdfbox,mathieufortin01/pdfbox,BezrukovM/veraPDF-pdfbox,mdamt/pdfbox,ChunghwaTelecom/pdfbox,gavanx/pdflearn,torakiki/sambox,gavanx/pdflearn,joansmith/pdfbox,veraPDF/veraPDF-pdfbox,ChunghwaTelecom/pdfbox,torakiki/sambox,mdamt/pdfbox,ZhenyaM/veraPDF-pdfbox,benmccann/pdfbox,joansmith/pdfbox,ZhenyaM/veraPDF-pdfbox