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.

Python/deepfreeze/README.txt

@@ -3,4 +3,4 @@ modules.  Python/frozen.c depends on these files.
 
 None of these files are committed into the repo.
 
-See Tools/scripts/freeze_modules.py for more info.
+See Tools/build/freeze_modules.py for more info.

Python/frozen.c

@@ -8,7 +8,7 @@
  * These files must be regenerated any time the corresponding .pyc
  * file would change (including with changes to the compiler, bytecode
  * format, marshal format).  This can be done with "make regen-frozen".
- * That make target just runs Tools/scripts/freeze_modules.py.
+ * That make target just runs Tools/build/freeze_modules.py.
  *
  * The freeze_modules.py script also determines which modules get
  * frozen.  Update the list at the top of the script to add, remove,

Python/frozen_modules/README.txt

@@ -4,4 +4,4 @@ modules.  Python/frozen.c depends on these files.
 Note that, other than the required frozen modules, none of these files
 are committed into the repo.
 
-See Tools/scripts/freeze_modules.py for more info.
+See Tools/build/freeze_modules.py for more info.

Python/stdlib_module_names.h

@@ -1,4 +1,4 @@
-// Auto-generated by Tools/scripts/generate_stdlib_module_names.py.
+// Auto-generated by Tools/build/generate_stdlib_module_names.py.
 // List used to create sys.stdlib_module_names.
 
 static const char* _Py_stdlib_module_names[] = {