configure: require bash >= 4.1 at compile time

We've unofficially agreed to raise our minimum supported bash version to
4.1, and since added features that require it. Additionally, an earlier
commit adds a syntax check to the builds of scripts/ and contrib/ which
could conceivably fail with an earlier shell. Therefore, make this a
hard requirement of the build process.

Signed-off-by: Dave Reisner <dreisner@archlinux.org>

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