* adjusted libtextencoding's Jamfile
* added libiconv.so to image
* added iconv headers to optional package Development (under 3rdparty)
* removed old private version of libiconv from textencoding
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@28631 a95241bf-73f2-0310-859d-f6bbb57e9c96