Huge thanks to gnarlie for helping me find and diagnose
several problems stemming from autogen.sh on FreeBSD 6.1

We require autoconf 2.58 for autogen.sh, but it seems like
that's always been the case, we just never caught it before :/

"bash ./configure" just about sums up what I want to do right now...

git-svn-id: https://svn.musicpd.org/mpd/trunk@4384 09075e82-0dd4-0310-85a5-a0d7c8717e4f