Fix incorrect replacements in Py_ to Ty_ renaming

Fixed several macros and constants that should not have been renamed:
- _Py_CAST, _Py_NULL, _Py_RVALUE (internal utility macros)
- Py_UNUSED (unused parameter macro)
- Py_EQ, Py_NE, Py_LT, Py_LE, Py_GT, Py_GE (comparison constants)
- Py_RETURN_* macros (NONE, TRUE, FALSE, NOTIMPLEMENTED, RICHCOMPARE)
- Py_READONLY, Py_ULL, Py_CONTEXT_SWITCHED
- TyGC_Head in generated clinic files

Build is still in progress with some remaining issues to resolve.

Co-authored-by: johndoe6345789 <224850594+johndoe6345789@users.noreply.github.com>

Python/fileutils.c

@@ -87,7 +87,7 @@ _Ty_device_encoding(int fd)
     _Ty_END_SUPPRESS_IPH
     Ty_END_ALLOW_THREADS
     if (!valid)
-        Ty_RETURN_NONE;
+        Py_RETURN_NONE;
 
 #ifdef MS_WINDOWS
 #ifdef HAVE_WINDOWS_CONSOLE_IO
@@ -101,12 +101,12 @@ _Ty_device_encoding(int fd)
     /* GetConsoleCP() and GetConsoleOutputCP() return 0 if the application
        has no console */
     if (cp == 0) {
-        Ty_RETURN_NONE;
+        Py_RETURN_NONE;
     }
 
     return TyUnicode_FromFormat("cp%u", (unsigned int)cp);
 #else
-    Ty_RETURN_NONE;
+    Py_RETURN_NONE;
 #endif /* HAVE_WINDOWS_CONSOLE_IO */
 #else
     if (_PyRuntime.preconfig.utf8_mode) {