* doc/Makefile.am: Always refer to cross-options.texi with $(srcdir). (MAINTAINERCLEANFILES): Add it.
* configure.ac, Makefile.am: Use build-aux. * config/prev-version, config/announce-gen, config/Makefile.am: Move to... * build-aux/prev-version, build-aux/announce-gen, * build-aux/Makefile.am: here.