Revert "debian/control: do not build-depend on libmenu-cache."

This reverts commit 0e9b8b9bbfa80401170d5fbcf0fb5190c35a49bb.
debian/control: don't be strict on libfm-semplice-extra4 dependency.

As it's a standalone library, using the upstream libfm-extra4 is fine.
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