Patch for raspberry pi 2 build

This will allow us to patch deb packager for building Raspberry Pi 2 packages on Scaleway servers.

More info on this can be found at https://github.com/chef/omnibus/issues/352. PR for improving omnibus is here https://github.com/chef/omnibus/pull/474. However, in our specific use case this won't be enough as OS we are using to build the package is Debian. The added patch file is applied at build time.

Edit to the makefile is also due to building on Debian, I want a clear separation between debian packages and packages build for RPI2.

Packages built this way were tested on Raspberry Pi 2 with Raspbian OS.