Remove redundant SDL version check from setup.py

This duplicates build_sdl.py and maybe isn't as useful as it used to be.
I could import from that module if I really need the check in setup.py.

Author: HexDecimal

setup.py

@@ -3,9 +3,7 @@
 
 from __future__ import annotations
 
-import os
 import platform
-import subprocess
 import sys
 from pathlib import Path
 
@@ -37,43 +35,11 @@ def get_package_data() -> list[str]:
     return files
 
 
-def check_sdl_version() -> None:
-    """Check the local SDL version on Linux distributions."""
-    if not sys.platform.startswith("linux"):
-        return
-    needed_version = "{}.{}.{}".format(*SDL_VERSION_NEEDED)
-    try:
-        sdl_version_str = subprocess.check_output(
-            ["pkg-config", "sdl3", "--modversion"],  # noqa: S607
-            universal_newlines=True,
-        ).strip()
-    except FileNotFoundError:
-        try:
-            sdl_version_str = subprocess.check_output(["sdl3-config", "--version"], universal_newlines=True).strip()  # noqa: S607
-        except FileNotFoundError as exc:
-            msg = (
-                f"libsdl3-dev or equivalent must be installed on your system and must be at least version {needed_version}."
-                "\nsdl3-config must be on PATH."
-            )
-            raise RuntimeError(msg) from exc
-    except subprocess.CalledProcessError as exc:
-        if sys.version_info >= (3, 11):
-            exc.add_note(f"Note: {os.environ.get('PKG_CONFIG_PATH')=}")
-        raise
-    print(f"Found SDL {sdl_version_str}.")
-    sdl_version = tuple(int(s) for s in sdl_version_str.split("."))
-    if sdl_version < SDL_VERSION_NEEDED:
-        msg = f"SDL version must be at least {needed_version}, (found {sdl_version_str})"
-        raise RuntimeError(msg)
-
-
 if not (SETUP_DIR / "libtcod/src").exists():
     print("Libtcod submodule is uninitialized.")
     print("Did you forget to run 'git submodule update --init'?")
     sys.exit(1)
 
-check_sdl_version()
-
 setup(
     py_modules=["libtcodpy"],
     packages=["tcod", "tcod.sdl", "tcod.__pyinstaller"],