* consider 05.51 based firmwares in remove_avm_vpn-patch. libikeapi.so cannot be removed in these firmwares as it is required by ctlmgr.
 * do it in a generic way by checking NEEDED-entries of ctlmgr and not by adding further FREETZ_AVM_VERSION_XX_XX symbol
 * fixes mklibs fails with 05.51 firmwares
 * refs #2078


git-svn-id: file:///var/svn/freetz/trunk@10409 149334a1-2f27-0410-a3b9-fc62619ac1e6