Update Python to 3.13.3 and add support to Windows on ARM64. (#1477)

Update Python to 3.13.0 and add support to Windows on AMD64. Rewrite
packaging of pywin32 because it is no longer shipped via separate binary
installers, but has migrated to use pip.

emsdk.py

@@ -143,11 +143,7 @@ if machine.startswith('x64') or machine.startswith('amd64') or machine.startswit
 elif machine.endswith('86'):
   ARCH = 'x86'
 elif machine.startswith('aarch64') or machine.lower().startswith('arm64'):
-  if WINDOWS:
-    errlog('No support for Windows on Arm, fallback to x64')
-    ARCH = 'x86_64'
-  else:
-    ARCH = 'arm64'
+  ARCH = 'arm64'
 elif machine.startswith('arm'):
   ARCH = 'arm'
 else:
@@ -988,17 +984,16 @@ def cmake_configure(generator, build_root, src_root, build_type, extra_cmake_arg
       generator = []
 
     cmdline = ['cmake'] + generator + ['-DCMAKE_BUILD_TYPE=' + build_type, '-DPYTHON_EXECUTABLE=' + sys.executable]
-    # Target macOS 10.14 at minimum, to support widest range of Mac devices
-    # from "Early 2008" and newer:
-    # https://en.wikipedia.org/wiki/MacBook_(2006-2012)#Supported_operating_systems
-    cmdline += ['-DCMAKE_OSX_DEPLOYMENT_TARGET=10.14']
+    # Target macOS 11.0 Big Sur at minimum, to support older Mac devices.
+    # See https://en.wikipedia.org/wiki/MacOS#Hardware_compatibility for min-spec details.
+    cmdline += ['-DCMAKE_OSX_DEPLOYMENT_TARGET=11.0']
     cmdline += extra_cmake_args + [src_root]
 
     print('Running CMake: ' + str(cmdline))
 
     # Specify the deployment target also as an env. var, since some Xcode versions
     # read this instead of the CMake field.
-    os.environ['MACOSX_DEPLOYMENT_TARGET'] = '10.14'
+    os.environ['MACOSX_DEPLOYMENT_TARGET'] = '11.0'
 
     def quote_parens(x):
       if ' ' in x: