Add lemon and gtk3 as build dependencies

This MR adds 2 new build dependencies to the nightly build (these are only needed for master).

• lemon is needed as one possible way to fix kicad/code/kicad#5013 (closed) is to move the generated grammar files out of our source tree and into the build directory. To do this, every build will require the lemon tool now.
• gtk3-devel will be needed to implement the move to trash feature currently in development.