fixup! fixup! fixup! fixup! fixup! fixup! fixup! fixup! fixup! fixup! Fix SDL install in CI

Author: HexDecimal

build_sdl.py

@@ -281,12 +281,10 @@ def get_emscripten_include_dir() -> Path:
 else:  # Unix
     matches = re.findall(
         r"-I(\S+)",
-        subprocess.check_output(
-            ["pkg-config", "sdl3", "--cflags"],
-            universal_newlines=True,
-            env={**os.environ, "PKG_CONFIG_ALLOW_SYSTEM_LIBS": "1"},
-        ),
+        subprocess.check_output(["pkg-config", "sdl3", "--cflags"], universal_newlines=True),
     )
+    if not matches:
+        matches = ["/usr/lib"]
     assert matches
 
     for match in matches: