Use the generic autogen.sh script.
* Makefile.am (EXTRA_DIST): Add autogen.rc. * autogen.rc: New. * autogen.sh: Update from current GnuPG. * ltmain.sh: Move to build-aux/. * compile: Ditto. * config.guess: Ditto. * config.sub: Ditto. * depcomp: Ditto. * doc/mdate-sh: Ditto. * doc/texinfo.tex: Ditto. * install-sh: Ditto. * missing: Ditto. * ylwrap: Ditto. * configure.ac (AC_CONFIG_AUX_DIR): New.