flake: update nixpkgs

• stdenvNoCC no longer requires clearing DEVELOPER_DIR and SDKROOT
• add package builds as checks

flake.lock

@@ -50,11 +50,11 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1734988233,
-        "narHash": "sha256-Ucfnxq1rF/GjNP3kTL+uTfgdoE9a3fxDftSfeLIS8mA=",
+        "lastModified": 1756381814,
+        "narHash": "sha256-tzo7YvAsGlzo4WiIHT0ooR59VHu+aKRQdHk7sIyoia4=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "de1864217bfa9b5845f465e771e0ecb48b30e02d",
+        "rev": "aca2499b79170038df0dbaec8bf2f689b506ad32",
         "type": "github"
       },
       "original": {

flake.nix

@@ -19,6 +19,7 @@
 		};
 	};
 	outputs = { self, nixpkgs, acextract, command-line, dsc-extractor, snap-util }: {
+
 		packages.aarch64-darwin = let
 			xcode = nixpkgs.legacyPackages.aarch64-darwin.xcodeenv.composeXcodeWrapper {};
 		in {
@@ -99,7 +100,6 @@
 					src = snap-util;
 					nativeBuildInputs = [ xcode ];
 					preBuild = ''
-						unset DEVELOPER_DIR SDKROOT
 						NIX_CFLAGS_COMPILE='-idirafter ${snapshot-header}/bsd'
 					'';
 					installPhase = ''
@@ -137,5 +137,7 @@
 					'';
 				};
 		};
+
+		checks = self.packages;
 	};
 }