build/llvmPackages: use projectRoot to find git diff file in assets

src/build/llvmPackages.ts

@@ -1,6 +1,6 @@
 import path from "path";
 import { GeneralVariable, LLVMVariable, command, variable } from "lyc/commands/cmake";
-import { SYSROOT_PREFIX } from "lyc/environment";
+import { SYSROOT_PREFIX, projectRoot } from "lyc/environment";
 import { PackageTask, buildPackage } from "./build";
 import { checkedSpawnSync } from "lyc/cli";
 import os from "os";
@@ -56,7 +56,7 @@ export function llvmPackages(src: string, installPrefix: string): PackageTask[]
                 checkedSpawnSync("git",
                     [
                         "apply",
-                        path.resolve(__dirname, "..", "..", "assets", "omp.diff"),
+                        path.resolve(projectRoot, "assets", "omp.diff"),
                     ], spawnOptions);
             },
             configurePhase: () => {