nanosaur: add missing libGL depend

Without the change the build fails as
https://hydra.nixos.org/build/294807086:

    CMake Error at /nix/store/ad4c8nx2lkjs4zq0sj9jdpn7w45v9ccs-cmake-3.31.6/share/cmake-3.31/Modules/FindPackageHandleStandardArgs.cmake:233 (message):
      Could NOT find OpenGL (missing: OPENGL_opengl_LIBRARY OPENGL_glx_LIBRARY
      OPENGL_INCLUDE_DIR)

ZHF: #403336

pkgs/by-name/na/nanosaur/package.nix

@@ -3,6 +3,7 @@
   stdenv,
   fetchFromGitHub,
   SDL2,
+  libGL,
   cmake,
   makeWrapper,
   unstableGitUpdater,
@@ -26,6 +27,7 @@ stdenv.mkDerivation rec {
   ];
   buildInputs = [
     SDL2
+    libGL
   ];
 
   installPhase = ''