configure: Don't enable maintainer mode if it is explicitly not requested.

[Andrew Nguyen]

Ben Klein noticed that debconf passed option --disable-maintainer-mode
to configure, which is converted to --enable-maintainer-mode=no. The
maintainer mode configure checks only examined the existence of the
option, and not whether the feature was actually requested, so
maintainer mode was being unexpectedly enabled.
---
 configure.ac |    7 ++++---
 1 files changed, 4 insertions(+), 3 deletions(-)
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