ensure accidentally installed *.la-files (into $STAGING_DIR) are going to be...

ensure accidentally installed *.la-files (into $STAGING_DIR) are going to be removed afterwards - this actually should be done within respective package-Makefiles itself, however they need to stay compatible with libtool v1.5.x which is used in backfire, since it (may) require those files

SVN-Revision: 24241