gh-97669: Create Tools/build/ directory (#97963)

Create Tools/build/ directory. Move the following scripts from
Tools/scripts/ to Tools/build/:

* check_extension_modules.py
* deepfreeze.py
* freeze_modules.py
* generate_global_objects.py
* generate_levenshtein_examples.py
* generate_opcode_h.py
* generate_re_casefix.py
* generate_sre_constants.py
* generate_stdlib_module_names.py
* generate_token.py
* parse_html5_entities.py
* smelly.py
* stable_abi.py
* umarshal.py
* update_file.py
* verify_ensurepip_wheels.py

Update references to these scripts.

Tools/scripts/generate_stdlib_module_names.py

@@ -1,137 +0,0 @@
-# This script lists the names of standard library modules
-# to update Python/stdlib_mod_names.h
-import _imp
-import os.path
-import re
-import subprocess
-import sys
-import sysconfig
-
-from check_extension_modules import ModuleChecker
-
-
-SRC_DIR = os.path.dirname(os.path.dirname(os.path.dirname(__file__)))
-STDLIB_PATH = os.path.join(SRC_DIR, 'Lib')
-
-IGNORE = {
-    '__init__',
-    '__pycache__',
-    'site-packages',
-
-    # Test modules and packages
-    '__hello__',
-    '__phello__',
-    '__hello_alias__',
-    '__phello_alias__',
-    '__hello_only__',
-    '_ctypes_test',
-    '_testbuffer',
-    '_testcapi',
-    '_testconsole',
-    '_testimportmultiple',
-    '_testinternalcapi',
-    '_testmultiphase',
-    '_xxsubinterpreters',
-    '_xxtestfuzz',
-    'distutils.tests',
-    'idlelib.idle_test',
-    'test',
-    'xxlimited',
-    'xxlimited_35',
-    'xxsubtype',
-}
-
-# Pure Python modules (Lib/*.py)
-def list_python_modules(names):
-    for filename in os.listdir(STDLIB_PATH):
-        if not filename.endswith(".py"):
-            continue
-        name = filename.removesuffix(".py")
-        names.add(name)
-
-
-# Packages in Lib/
-def list_packages(names):
-    for name in os.listdir(STDLIB_PATH):
-        if name in IGNORE:
-            continue
-        package_path = os.path.join(STDLIB_PATH, name)
-        if not os.path.isdir(package_path):
-            continue
-        if any(package_file.endswith(".py")
-               for package_file in os.listdir(package_path)):
-            names.add(name)
-
-
-# Built-in and extension modules built by Modules/Setup*
-# includes Windows and macOS extensions.
-def list_modules_setup_extensions(names):
-    checker = ModuleChecker()
-    names.update(checker.list_module_names(all=True))
-
-
-# List frozen modules of the PyImport_FrozenModules list (Python/frozen.c).
-# Use the "./Programs/_testembed list_frozen" command.
-def list_frozen(names):
-    submodules = set()
-    for name in _imp._frozen_module_names():
-        # To skip __hello__, __hello_alias__ and etc.
-        if name.startswith('__'):
-            continue
-        if '.' in name:
-            submodules.add(name)
-        else:
-            names.add(name)
-    # Make sure all frozen submodules have a known parent.
-    for name in list(submodules):
-        if name.partition('.')[0] in names:
-            submodules.remove(name)
-    if submodules:
-        raise Exception(f'unexpected frozen submodules: {sorted(submodules)}')
-
-
-def list_modules():
-    names = set(sys.builtin_module_names)
-    list_modules_setup_extensions(names)
-    list_packages(names)
-    list_python_modules(names)
-    list_frozen(names)
-
-    # Remove ignored packages and modules
-    for name in list(names):
-        package_name = name.split('.')[0]
-        # package_name can be equal to name
-        if package_name in IGNORE:
-            names.discard(name)
-
-    for name in names:
-        if "." in name:
-            raise Exception("sub-modules must not be listed")
-
-    return names
-
-
-def write_modules(fp, names):
-    print("// Auto-generated by Tools/scripts/generate_stdlib_module_names.py.",
-          file=fp)
-    print("// List used to create sys.stdlib_module_names.", file=fp)
-    print(file=fp)
-    print("static const char* _Py_stdlib_module_names[] = {", file=fp)
-    for name in sorted(names):
-        print(f'"{name}",', file=fp)
-    print("};", file=fp)
-
-
-def main():
-    if not sysconfig.is_python_build():
-        print(f"ERROR: {sys.executable} is not a Python build",
-              file=sys.stderr)
-        sys.exit(1)
-
-    fp = sys.stdout
-    names = list_modules()
-    write_modules(fp, names)
-
-
-if __name__ == "__main__":
-    main()