Revert "dep/msvc: Update SDL2 to 2.0.14"

This reverts commit 8debaa34d9.

Seems to be a few regressions, namely XBox Controller Rumble, other
controllers not detecting, etc.

dep/msvc/sdl2/include/SDL_locale.h

@@ -1,101 +0,0 @@
-/*
-  Simple DirectMedia Layer
-  Copyright (C) 1997-2020 Sam Lantinga <slouken@libsdl.org>
-
-  This software is provided 'as-is', without any express or implied
-  warranty.  In no event will the authors be held liable for any damages
-  arising from the use of this software.
-
-  Permission is granted to anyone to use this software for any purpose,
-  including commercial applications, and to alter it and redistribute it
-  freely, subject to the following restrictions:
-
-  1. The origin of this software must not be misrepresented; you must not
-     claim that you wrote the original software. If you use this software
-     in a product, an acknowledgment in the product documentation would be
-     appreciated but is not required.
-  2. Altered source versions must be plainly marked as such, and must not be
-     misrepresented as being the original software.
-  3. This notice may not be removed or altered from any source distribution.
-*/
-
-/**
- *  \file SDL_locale.h
- *
- *  Include file for SDL locale services
- */
-
-#ifndef _SDL_locale_h
-#define _SDL_locale_h
-
-#include "SDL_stdinc.h"
-#include "SDL_error.h"
-
-#include "begin_code.h"
-/* Set up for C function definitions, even when using C++ */
-#ifdef __cplusplus
-/* *INDENT-OFF* */
-extern "C" {
-/* *INDENT-ON* */
-#endif
-
-
-typedef struct SDL_Locale
-{
-    const char *language;  /**< A language name, like "en" for English. */
-    const char *country;  /**< A country, like "US" for America. Can be NULL. */
-} SDL_Locale;
-
-/**
- *  \brief Report the user's preferred locale.
- *
- *  This returns an array of SDL_Locale structs, the final item zeroed out.
- *  When the caller is done with this array, it should call SDL_free() on
- *  the returned value; all the memory involved is allocated in a single
- *  block, so a single SDL_free() will suffice.
- *
- *  Returned language strings are in the format xx, where 'xx' is an ISO-639
- *  language specifier (such as "en" for English, "de" for German, etc).
- *  Country strings are in the format YY, where "YY" is an ISO-3166 country
- *  code (such as "US" for the United States, "CA" for Canada, etc). Country
- *  might be NULL if there's no specific guidance on them (so you might get
- *  { "en", "US" } for American English, but { "en", NULL } means "English
- *  language, generically"). Language strings are never NULL, except to
- *  terminate the array.
- *
- *  Please note that not all of these strings are 2 characters; some are
- *  three or more.
- *
- *  The returned list of locales are in the order of the user's preference.
- *  For example, a German citizen that is fluent in US English and knows
- *  enough Japanese to navigate around Tokyo might have a list like:
- *  { "de", "en_US", "jp", NULL }. Someone from England might prefer British
- *  English (where "color" is spelled "colour", etc), but will settle for
- *  anything like it: { "en_GB", "en", NULL }.
- *
- *  This function returns NULL on error, including when the platform does not
- *  supply this information at all.
- *
- *  This might be a "slow" call that has to query the operating system. It's
- *  best to ask for this once and save the results. However, this list can
- *  change, usually because the user has changed a system preference outside
- *  of your program; SDL will send an SDL_LOCALECHANGED event in this case,
- *  if possible, and you can call this function again to get an updated copy
- *  of preferred locales.
- *
- *   \return array of locales, terminated with a locale with a NULL language
- *           field. Will return NULL on error.
- */
-extern DECLSPEC SDL_Locale * SDLCALL SDL_GetPreferredLocales(void);
-
-/* Ends C function definitions when using C++ */
-#ifdef __cplusplus
-/* *INDENT-OFF* */
-}
-/* *INDENT-ON* */
-#endif
-#include "close_code.h"
-
-#endif /* _SDL_locale_h */
-
-/* vi: set ts=4 sw=4 expandtab: */