Revert "Create wrapper directory outside of /bin/ for FHS chroots to be closer to FHS"

This reverts commit 9deb7f8aae431ed7725cfaa13edf8645d19d91f2.
tinc_pre: Add derivation

The tinc developer has made significant developments to the next version
of tinc including many protocol security fixes. This patch adds the
prerelease of the next major tinc release.
tinc_pre: Experimental Patches