jack_oscrolloscope: fix build

commit 7aeac03 (PR #386495) dropped libX11 and libGLU from propagatedBuildInputs in SDL_compat, and #389106 pointed SDL to SDL_compat, which broke this build

Hydra fail: https://hydra.nixos.org/build/292734958

pkgs/by-name/ja/jack_oscrolloscope/package.nix

···
   libjack2,
   libGLU,
   libGL,
+  libX11,
   pkg-config,
 }:
 
···
     libjack2
     libGLU
     libGL
+    libX11
   ];
 
   installPhase = ''