Ports: Remove Python setlocale patch that's no longer needed

Since 4cd45f5, setlocale() always pretends to succeed.

Ports/python3/patches/ReadMe.md

@@ -12,10 +12,6 @@ Enforce UTF-8 as encoding by defining `_Py_FORCE_UTF8_LOCALE`.
 
 As usual, make the `configure` script recognize Serenity. Also set `MACHDEP` (which is used for `sys.platform`) to a version-less `serenityos`, even when not cross-compiling.
 
-## `remove-setlocale-from-preconfig.patch`
-
-Our stub implementation of `setlocale()` always returns `nullptr`, which the interpreter considers critical enough to exit right away.
-
 ## `webbrowser.patch`
 
 Register the SerenityOS Browser in the [`webbrowser`](https://docs.python.org/3/library/webbrowser.html) module.

Ports/python3/patches/remove-setlocale-from-preconfig.patch

@@ -1,30 +0,0 @@
---- Python-3.9.6/Python/preconfig.c	2021-02-21 20:22:44.076023521 +0100
-+++ Python-3.9.6/Python/preconfig.c	2021-02-21 20:36:10.936698893 +0100
-@@ -790,16 +790,6 @@
- 
-     preconfig_get_global_vars(config);
- 
--    /* Copy LC_CTYPE locale, since it's modified later */
--    const char *loc = setlocale(LC_CTYPE, NULL);
--    if (loc == NULL) {
--        return _PyStatus_ERR("failed to LC_CTYPE locale");
--    }
--    char *init_ctype_locale = _PyMem_RawStrdup(loc);
--    if (init_ctype_locale == NULL) {
--        return _PyStatus_NO_MEMORY();
--    }
--
-     /* Save the config to be able to restore it if encodings change */
-     PyPreConfig save_config;
- 
-@@ -899,10 +889,6 @@
-     status = _PyStatus_OK();
- 
- done:
--    if (init_ctype_locale != NULL) {
--        setlocale(LC_CTYPE, init_ctype_locale);
--        PyMem_RawFree(init_ctype_locale);
--    }
-     Py_UTF8Mode = init_utf8_mode ;
- #ifdef MS_WINDOWS
-     Py_LegacyWindowsFSEncodingFlag = init_legacy_encoding;