autogen.sh is not neccessary

A minor nitpick, but `autogen.sh` is not neccessary: you can get the same effect by using autoreconf -i, and setting `AM_OPTIONS=foreign` in `Makefile.am` (and perhaps some other settings in either `Makefile.am` or `configure.ac` - but autoreconf -i can do everything autogen.sh does, just better).

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