Remove node stdin tty hack (#9476)

Fixes #6505

src/library_tty.js

@@ -110,28 +110,15 @@ mergeInto(LibraryManager.library, {
  var buf = Buffer.alloc ? Buffer.alloc(BUFSIZE) : new Buffer(BUFSIZE);
  var bytesRead = 0;
 
- var isPosixPlatform = (process.platform != 'win32'); // Node doesn't offer a direct check, so test by exclusion
-
- var fd = process.stdin.fd;
- if (isPosixPlatform) {
- // Linux and Mac cannot use process.stdin.fd (which isn't set up as sync)
- var usingDevice = false;
- try {
- fd = fs.openSync('/dev/stdin', 'r');
- usingDevice = true;
- } catch (e) {}
- }
-
  try {
- bytesRead = fs.readSync(fd, buf, 0, BUFSIZE, null);
+ bytesRead = fs.readSync(process.stdin.fd, buf, 0, BUFSIZE, null);
  } catch(e) {
  // Cross-platform differences: on Windows, reading EOF throws an exception, but on other OSes,
  // reading EOF returns 0. Uniformize behavior by treating the EOF exception to return 0.
  if (e.toString().indexOf('EOF') != -1) bytesRead = 0;
  else throw e;
  }
 
- if (usingDevice) { fs.closeSync(fd); }
  if (bytesRead > 0) {
  result = buf.slice(0, bytesRead).toString('utf-8');
  } else {