main/dropbear: create /etc/dropbear in package

Merged Sertonix requested to merge Sertonix/aports:dropbear-without-openrc into master

When running dropbear by hand without the openrc script it currently fails because /etc/deopbear is missing. The original dropbear package for debian adds this directory to the package. This does the same thing so dropbear can be used more easily.

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