bootstrap.sh: Detect ubuntu-style of naming multiple autoconf versions.

[Leonid Evdokimov]

Hello,

Here is small patch for bootstrap.sh that is required to find proper
autoconf version on ubuntu-based buildhost.

-- 
WBRBW, Leonid Evdokimov
xmpp:l...@darkk.net.ru && http://darkk.net.ru && tel:+79050965222

bootstrap-at-ubuntu.merge
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