[Apple Silicon] [build-script] Support stdlib macOS arm64/arm64e

Author: shahmishal

utils/swift_build_support/swift_build_support/targets.py

@@ -219,6 +219,10 @@ def host_target():
         elif system == 'Darwin':
             if machine == 'x86_64':
                 return StdlibDeploymentTarget.OSX.x86_64
+            elif machine == 'arm64':
+                return StdlibDeploymentTarget.OSX.arm64
+            elif machine == 'arm64e':
+                return StdlibDeploymentTarget.OSX.arm64e
 
         elif system == 'FreeBSD':
             if machine == 'amd64':