- drop autoconf min version to 2.68, version in Ubuntu precise
- drop autoconf min version to 2.68, version in Ubuntu precise

infinity0/flashproxy,glamrock/flashproxy,infinity0/flashproxy,glamrock/flashproxy,glamrock/flashproxy,arlolra/flashproxy,arlolra/flashproxy,arlolra/flashproxy,arlolra/flashproxy,arlolra/flashproxy,infinity0/flashproxy,infinity0/flashproxy,glamrock/flashproxy,glamrock/flashproxy,arlolra/flashproxy,glamrock/flashproxy,arlolra/flashproxy,infinity0/flashproxy,infinity0/flashproxy