Bug#651134: transition glibmm2.4 for multiarch

[Evan Broder]

I've been informed by Steve Langasek that he prefers the substvar
${misc:Pre-Depends} over explicitly pre-depending on multiarch-support
so that we can easily phase out the pre-dependency when it's no longer
needed for transitional purposes.

Therefore, here is a patch which uses the substvar instead. It also
requires a debhelper build-dep bump, because 8.1.3 was the version
debhelper version to support that substvar.

Thanks,
 - Evan
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