* lib/am/texibuild.am (?GENERIC?%SOURCE_SUFFIX%.html, ?!GENERIC?%DEST_PREFIX%.html): Output .htp, and then rename to .html on success. In case the target is a directory, this ensures its time stamp is updated and the no files are left over inside. * tests/txinfo21.test: Augment to test missing timestamp update reported by Akim Demaille.