Fix ninja path for macos-arm CI tests

Author: cknitt

scripts/buildNinjaBinary.js

@@ -20,10 +20,6 @@ if (platform === "win32") {
 }
 
 const src = path.join(ninjaDir, `ninja${platform === "win32" ? ".exe" : ""}`);
-
-const dst =
-  platform === "darwin" && process.arch === "arm64"
-    ? path.join(__dirname, "..", process.platform + process.arch, `ninja.exe`)
-    : path.join(__dirname, "..", platform, `ninja.exe`);
+const dst = require("./bin_path").ninja_exe;
 
 fs.copyFileSync(src, dst);

scripts/ciTest.js

@@ -57,7 +57,7 @@ function init() {
       vendorOCamlPath + path.delimiter + process.env["PATH"];
   }
 
-  var ninjaPath = path.join(__dirname, "..", process.platform, "ninja.exe");
+  var ninjaPath = require("./bin_path").ninja_exe;
 
   if (!fs.existsSync(ninjaPath)) {
     throw new Error("ninja could not be configured");