* Merge from Debian unstable, remaining changes: - Build with -Wno-error. - Build with thread support. Some guile-using programs like autogen need it. - Add debian/guile-1.8-libs.shlibs: Thread support breaks ABI, bump the soname. * Dropped changes: - libltdl3-dev -> libltdl7-dev: current libltdl-dev Provides: both. - debian/patches/libtool-ftbfs.diff: integrated upstream.