[PATCH] travis: move linux parameters back to toplevel to allow env combinations to work properly
|travis linux regression
This should remove our surplus linux/openjdk8/non-headless build from travis. The
matrix subsection is really only useful for adding "extra" builds that lie outside the normal env-parameter-combinations matrix. Confusingly named.
I'm a little concerned that now we have no travis builds with javafx enabled, but left it as is for now.