WIP: Check ubuntu1804_gcc7 build timeouts

I've been having an issue with the `ubuntu1804_gcc7` build timing out on
a change that touches a lot of code. I'm adding a small comment deep in
the code to cause a recompile that should not take longer than what is
already on master. If this cannot succeed without timing out, then there
must be an issue with the existing code on master not compiling within
the timeout time.
7 jobs for wip-check-ubuntu1804-gcc7