autoconf213-2.13-bp150.2.4

- Explicitly BuildRequire m4: do not rely on the build system to
  contain this dependency for us.

- Move %install_info_delete from postun to preun: we need to handle
  the case while the file is still present.
- Fix filename of info files for post/preun: autoconf213.info.gz.

- Added url as source.
  Please see http://en.opensuse.org/SourceUrls

- buildrequire makeinfo

- remove call to suse_update_config (very old work around)

- Remove redundant tags/sections from specfile
- Use %_smp_mflags for parallel build

- enable parallel building

- initial autoconf 2.13 package based on Fedora's package