Makefile cleanup
Makefile cleanup

- add autoconf files to distclean
- find antimake even when unconfigured
- proper error message when unconfigured
- make deb shortcut - needs to be run in configured tree

kvap/pgbouncer,kvap/pgbouncer,digoal/pgbouncer-x2,wurenny/pgbouncer-x2,wurenny/pgbouncer-x2,jaiminpan/pgbouncer,jaiminpan/pgbouncer,kvap/pgbouncer,dbaxa/pgbouncer,wurenny/pgbouncer-x2,digoal/pgbouncer-x2,jaiminpan/pgbouncer,dbaxa/pgbouncer,wurenny/pgbouncer-x2,dbaxa/pgbouncer,jaiminpan/pgbouncer,dbaxa/pgbouncer,digoal/pgbouncer-x2,digoal/pgbouncer-x2,kvap/pgbouncer