Squid /run dir and apparmor fixes

Sergio Durigan Juniorrequested to merge
sergiodj/squid:squid-run-dir-and-apparmor-fixes into master

Hi there,

I'd like to propose these fixes to the squid package. They are pretty self-documented, but it's basically a simple apparmor profile addition that is needed in order to make sure that squid can use /run/systemd/notify, and some modifications to make sure that the /run/squid directory gets created dynamically when the systemd service is started.

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