fix(nix): fix nix build

- Update flake.lock
- Switch to correct version of sk_gpu.zip in /nix/sk_gpu.nix
- Add xkeyboard_config and libgbm to dependencies in
  /nix/stardust-xr-server.nix
- Add openxr-loader to github fetches and add it to CPM local packages

nix/sk_gpu.nix

@@ -3,8 +3,8 @@
 let
   sk_gpu_zip = fetchurl {
     url =
-      "https://github.com/StereoKit/sk_gpu/releases/download/v2024.8.16/sk_gpu.v2024.8.16.zip";
-    sha256 = "sha256-Wk3PZFlWqhrsQ8xG0sQaV2xSasdg2D7TMiPvl/CgtGU=";
+      "https://github.com/StereoKit/sk_gpu/releases/download/v2024.9.26/sk_gpu.v2024.9.26.zip";
+    sha256 = "sha256-W32RveeCszioWGtbCsvAqB28YHvOsw2xJ15MosYLFXk=";
   };
 in stdenv.mkDerivation rec {
   name = "sk_gpu";

nix/stardust-xr-server.nix

@@ -6,6 +6,7 @@
 , xorg
 , fontconfig
 , libxkbcommon
+, xkeyboard_config
 , libclang
 
 , cmake
@@ -15,6 +16,7 @@
 , fetchFromGitHub
 , sk_gpu
 , libXau
+, libgbm
 
 , libXdmcp
 , stdenv
@@ -47,10 +49,17 @@ rustPlatform.buildRustPackage rec {
     rev = "900e40fb5d2502927360fe2f31762bdbb624455f";
     sha256 = "sha256-zBRAXgG5Fi6+5uPQCI/RCGatY6O4ELuYBoKrPNn4K+8=";
   };
+  openxr_loader = fetchFromGitHub {
+    owner = "KhronosGroup";
+    repo = "OpenXR-SDK";
+    rev = "288d3a7ebc1ad959f62d51da75baa3d27438c499";
+    sha256 = "sha256-RdmnBe26hqPmqwCHIJolF6bSmZRmIKVlGF+TXAY35ig=";
+  };
 
   DEP_MESHOPTIMIZER_SOURCE = "${meshoptimizer}";
   DEP_BASIS_UNIVERSAL_SOURCE = "${basis_universal}";
   DEP_SK_GPU_SOURCE = "${sk_gpu}";
+  DEP_OPENXR_LOADER_SOURCE = "${openxr_loader}";
 
   postPatch = let libPath = lib.makeLibraryPath [ stdenv.cc.cc.lib ];
   in ''
@@ -78,9 +87,11 @@ rustPlatform.buildRustPackage rec {
     xorg.libXfixes
     fontconfig
     libxkbcommon
+    xkeyboard_config
     libXau
     libXdmcp
     openxr-loader
+    libgbm
   ];
   LIBCLANG_PATH = "${libclang.lib}/lib";
 }