configure: Apply updates proposed by autoupdate

'autoupdate' is a tool to help developer to update configure.ac.

This patch applies a few fixes as suggested by autoupdate.

It was tested on Debian 6.0.7 (Squeeze) and Fedora 17 (Beefy Miracle).

Signed-off-by: Yann Droneaud <ydroneaud@opteya.com>
Signed-off-by: Roland Dreier <roland@purestorage.com>
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