PDFBOX-2147: remove unused imports

git-svn-id: https://svn.apache.org/repos/asf/pdfbox/trunk@1610133 13f79535-47bb-0310-9956-ffa450edef68
PDFBOX-2147: remove unused imports

git-svn-id: https://svn.apache.org/repos/asf/pdfbox/trunk@1610135 13f79535-47bb-0310-9956-ffa450edef68