vc4: add compile test for arm neon support

Not all toolchains are able to compile the runtime
optional vc4 neon support, so add an meson compile
test for arm neon support.

Signed-off-by: Peter Seiderer <ps.report@gmx.net>
45 jobs for !4120 with ps-devel-fix-vc4-neon-002 in 20 minutes and 34 seconds (queued for 7 seconds)
latest merge request