gclient: Stop running git under "arch" on macOS

We now have an arm python binary, so this should no longer be needed.

Bug: 1103326,1184767,1103236
Change-Id: I5510bf2c61adc2d0d505a886956a6677303df271
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/2888957
Auto-Submit: Nico Weber <thakis@chromium.org>
Commit-Queue: Dirk Pranke <dpranke@google.com>
Reviewed-by: Dirk Pranke <dpranke@google.com>

gclient_scm.py

@@ -1377,22 +1377,6 @@ class GitWrapper(SCMWrapper):
       revision = self._Capture(['rev-parse', 'FETCH_HEAD'])
     return revision
 
-  def _IsRunningUnderRosetta(self):
-    if sys.platform != 'darwin':
-      return False
-    if self._running_under_rosetta is None:
-      # If we are running under Rosetta, platform.machine() is
-      # 'x86_64'; we need to use a sysctl to see if we're being
-      # translated.
-      import ctypes
-      libSystem = ctypes.CDLL("libSystem.dylib")
-      ret = ctypes.c_int(0)
-      size = ctypes.c_size_t(4)
-      e = libSystem.sysctlbyname(ctypes.c_char_p(b'sysctl.proc_translated'),
-                                 ctypes.byref(ret), ctypes.byref(size), None, 0)
-      self._running_under_rosetta = e == 0 and ret.value == 1
-    return self._running_under_rosetta
-
   def _Run(self, args, options, **kwargs):
     # Disable 'unused options' warning | pylint: disable=unused-argument
     kwargs.setdefault('cwd', self.checkout_path)
@@ -1401,18 +1385,6 @@ class GitWrapper(SCMWrapper):
     env = scm.GIT.ApplyEnvVars(kwargs)
 
     cmd = ['git'] + args
-
-    if self._IsRunningUnderRosetta():
-      # We currently only ship an Intel Python binary in depot_tools.
-      # Intel binaries run under Rosetta on ARM Macs, and by default
-      # prefer to run their subprocesses as Intel under Rosetta too.
-      # Intel git running under Rosetta has a bug where it fails to
-      # clone src.git (rdar://7868319), so until we ship a native
-      # ARM python3 binary, explicitly use `arch` to let git run
-      # the native ARM slice instead of the Intel slice.
-      # TODO(thakis): Remove this again once we ship an arm64 python3
-      # binary.
-      cmd = ['arch', '-arch', 'arm64e', '-arch', 'arm64'] + cmd
     gclient_utils.CheckCallAndFilter(cmd, env=env, **kwargs)