tests: Fix runtime dependencies

• tests: Make tests dict elements dicts themselves

  Previously each value was a list of extra sources. The next commit will add an additional field to each test, so they need to be dicts themselves.

• tests: Add support for specifying runtime dependencies

• tests: Depend on exec-fd-leak-checker

  Closes: #514

• egl: Make wayland-egl symbols check depend on wayland_egl

  Closes: #515