We now have to start to care about ABI compatibility now that shared
libraries are being used. So ensure that internal symbols are not
visible outside of the library.
git-svn-id: svn+ssh://cvs.lpds.sztaki.hu/var/lib/svn/szdg/dcapi/trunk@2243 a7169a2c-3604-0410-bc95-c702d8d87f7a