Update EGL init code for Python 3.12.

Fixes google-deepmind/mujoco#1299.

PiperOrigin-RevId: 595982512
Change-Id: I1824f5dd79b24d677772d69aca585ad36d08e2c2

Author: nimrod-gileadi

dm_control/_render/pyopengl/egl_renderer.py

@@ -103,12 +103,13 @@ def _platform_init(self, unused_max_width, unused_max_height):
     """Initialization this EGL context."""
     num_configs = ctypes.c_long(0)
     config_size = 1
-    config = EGL.EGLConfig()
+    # ctypes syntax for making an array of length config_size.
+    configs = (EGL.EGLConfig * config_size)()
     EGL.eglReleaseThread()
     EGL.eglChooseConfig(
         EGL_DISPLAY,
         EGL_ATTRIBUTES,
-        ctypes.byref(config),
+        configs,
         config_size,
         num_configs)
     if num_configs.value < 1:
@@ -117,7 +118,7 @@ def _platform_init(self, unused_max_width, unused_max_height):
           'desired attributes: {}'.format(EGL_ATTRIBUTES))
     EGL.eglBindAPI(EGL.EGL_OPENGL_API)
     self._context = EGL.eglCreateContext(
-        EGL_DISPLAY, config, EGL.EGL_NO_CONTEXT, None)
+        EGL_DISPLAY, configs[0], EGL.EGL_NO_CONTEXT, None)
     if not self._context:
       raise RuntimeError('Cannot create an EGL context.')