zynaddsubfx: disable PortChecker test unconditionally (#353529)

  # TODO: Update cmake hook to make it simpler to selectively disable cmake tests: #113829

  checkPhase = let

    disabledTests =

      # PortChecker test fails when lashSupport is enabled because

      # zynaddsubfx takes to long to start trying to connect to lash

      lib.optionals lashSupport [ "PortChecker" ]

      # PortChecker is non-deterministic. It's fixed in the master

      # branch, but backporting would require an update to rtosc, so

      # we'll just disable it until the next release.

      [ "PortChecker" ]

      # Tests fail on aarch64

      ++ lib.optionals stdenv.hostPlatform.isAarch64 [ "MessageTest" "UnisonTest" ];