Allowing either an empty string or a new line in test where no output…

… should be given due to os differences.

test/build.test.js

@@ -138,7 +138,7 @@ apps.forEach((app) => {
     run('node-pre-gyp', 'configure', '--loglevel=info -- -Dfoo=bar', app, {}, (err, stdout, stderr) => {
       t.ifError(err);
       const clean = stdout.replaceAll('\n', '')
-      t.equal(stdout, clean);
+      t.equal(clean, '');
       t.ok(stderr.search(/(gyp info spawn args).*(-Dfoo=bar)/) > -1);
       t.end();
     });