Resolve build issues for win32/wine systems

Author: sparks

video/out/gpu_next/context.c

@@ -253,7 +253,7 @@ void gpu_ctx_destroy(struct gpu_ctx **ctxp)
     *ctxp = NULL;
 }
 
-#if HAVE_GL
+#if HAVE_GL && defined(PL_HAVE_OPENGL)
 /**
  * @brief Callback to make the OpenGL context current.
  * @param priv Pointer to the private data (mpv_opengl_init_params).

video/out/gpu_next/libmpv_gpu_next.c

@@ -21,7 +21,9 @@ struct priv {
 * List of available API context implementations (e.g., GL, Vulkan - currently only OpenGL)
 */
 static const struct libmpv_gpu_next_context_fns *context_backends[] = {
+#if HAVE_GL && defined(PL_HAVE_OPENGL)
     &libmpv_gpu_next_context_gl,
+#endif
     NULL
 };
 
@@ -273,23 +275,6 @@ static void perfdata(struct render_backend *ctx,
 {
 }
 
-/*
- * @brief Initializes the render_backend.
- * @param ctx The render_backend context.
- * @return 0 on success, negative error code on failure.
- */
-static int init(struct render_backend *ctx)
-{
-    struct priv *p = ctx->priv;
-    if (!p) return MPV_ERROR_UNINITIALIZED;
-
-    // Initialize the video engine.
-    p->video_engine = pl_video_create(p->context);
-    if (!p->video_engine) return MPV_ERROR_GENERIC;
-
-    return 0;
-}
-
 const struct render_backend_fns render_backend_gpu_next = {
     .init = init,
     .destroy = destroy,