fix cargo run on nixos

this boils down to adding some extra dependencies to the shell
environment. they're also inherited from craneArgs because the ones from
the package are actually transformed into the WRONG outputs of the
packages. also refactors to use craneLib.devShell because it's somewhat
cleaner.

flake.nix

@@ -42,9 +42,9 @@
           src = nixpkgs.lib.cleanSourceWith {
             src = craneLib.path ./.;
             filter = path: type:
-              (builtins.match "resources" path == null) ||
-              ((craneLib.filterCargoSources path type) &&
-              (builtins.match "niri-visual-tests" path == null));
+              (builtins.match "resources" path == null)
+              || ((craneLib.filterCargoSources path type)
+                && (builtins.match "niri-visual-tests" path == null));
           };
 
           nativeBuildInputs = with pkgs; [
@@ -68,6 +68,9 @@
             stdenv.cc.cc.lib
             pipewire
             pango
+            cairo
+            glib
+            pixman
           ];
 
           runtimeDependencies = with pkgs; [
@@ -91,22 +94,11 @@
         checks.niri = niri;
         packages.default = niri;
 
-        devShells.default = pkgs.mkShell.override {stdenv = pkgs.clangStdenv;} rec {
+        devShells.default = craneLib.devShell {
+          inputsFrom = [niri];
+
+          LD_LIBRARY_PATH = pkgs.lib.makeLibraryPath (craneArgs.runtimeDependencies ++ craneArgs.nativeBuildInputs ++ craneArgs.buildInputs);
           inherit (niri) LIBCLANG_PATH;
-          packages = niri.runtimeDependencies ++ niri.nativeBuildInputs ++ niri.buildInputs;
-
-          # Force linking to libEGL, which is always dlopen()ed, and to
-          # libwayland-client, which is always dlopen()ed except by the
-          # obscure winit backend.
-          RUSTFLAGS = map (a: "-C link-arg=${a}") [
-            "-Wl,--push-state,--no-as-needed"
-            "-lEGL"
-            "-lwayland-client"
-            "-Wl,--pop-state"
-          ];
-
-          LD_LIBRARY_PATH = pkgs.lib.makeLibraryPath packages;
-          PKG_CONFIG_PATH = pkgs.lib.makeLibraryPath packages;
         };
       }
     );