refactor(args): rename variable for clarity in macOS runtime scripts

Entire-Checkpoint: c6e522b4276c

tools/embedded-mpv/build-macos-runtime.mjs

@@ -5,7 +5,8 @@ import os from 'os';
 import path from 'path';
 import { spawnSync } from 'child_process';
 
-const args = process.argv.slice(2);
+const rawArgs = process.argv.slice(2);
+const args = rawArgs[0] === '--' ? rawArgs.slice(1) : rawArgs;
 const [arch, rawPrefix] = args;
 const validArchitectures = new Set(['arm64', 'x64']);
 const macosDeploymentTarget =

tools/embedded-mpv/stage-macos-runtime.mjs

@@ -1,7 +1,8 @@
 import fs from 'fs';
 import path from 'path';
 
-const args = process.argv.slice(2);
+const rawArgs = process.argv.slice(2);
+const args = rawArgs[0] === '--' ? rawArgs.slice(1) : rawArgs;
 const [arch, sourcePrefix] = args;
 const validArchitectures = new Set(['arm64', 'x64']);
 const workspaceRoot = process.cwd();