Use libgedit-amtk if available

Amin Bandalirequested to merge
bandali/gyrus:libgedit-amtk-dependency into master

Upstream renamed from amtk to libgedit-amtk, so check dependency with the new name first, and fall back to the old name if not found.

This is in preparation for an upcoming transition in Debian for renaming the amtk Debian packages to libgedit-amtk, following upstream.

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