Fetch updates from libtcod and change the default renderer to SDL2.

Author: HexDecimal

CHANGELOG.md

@@ -4,6 +4,9 @@ Changes relevant to the users of python-tcod are documented here.
 This project adheres to [Semantic Versioning](https://semver.org/) since version `2.0.0`.
 
 ## [Unreleased]
+### Changed
+- The SDL2 renderer has had a major performance update when compiled with SDL 2.0.18.
+- SDL2 is now the default renderer to avoid rare issues with the OpenGL 2 renderer.
 
 ## [13.6.0] - 2022-02-19
 ### Added

build_libtcod.py

@@ -15,12 +15,6 @@
 
 import build_sdl  # noqa: E402
 
-# The SDL2 version to parse and export symbols from.
-SDL2_PARSE_VERSION = os.environ.get("SDL_VERSION", "2.0.5")
-
-# The SDL2 version to include in binary distributions.
-SDL2_BUNDLE_VERSION = os.environ.get("SDL_VERSION", "2.0.14")
-
 Py_LIMITED_API = 0x03060000
 
 HEADER_PARSE_PATHS = ("tcod/", "libtcod/src/libtcod/")

libtcod

@@ -464,7 +464,7 @@ def new(
         Added the `console` parameter.
     """
     if renderer is None:
-        renderer = RENDERER_OPENGL2
+        renderer = RENDERER_SDL2
     if sdl_window_flags is None:
         sdl_window_flags = SDL_WINDOW_RESIZABLE
     if argv is None: