Follow-up to r29925: Fix support for Libtool 2.2.
Follow-up to r29925: Fix support for Libtool 2.2.

* autogen.sh:
   Copy config.guess and config.sub to build.
   Don't ignore missing .m4 files when Libtool 2 is used.

jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion