Disable the EGL render thread on Wayland

app/streaming/video/ffmpeg-renderers/eglvid.cpp

@@ -747,6 +747,13 @@ bool EGLRenderer::specialize() {
     return err == GL_NO_ERROR;
 }
 
+bool EGLRenderer::isRenderThreadSupported()
+{
+    // libdecor may try to draw CSD on our window surface which will race with
+    // our rendering code here, so we must not use the render thread on wayland.
+    return strcmp(SDL_GetCurrentVideoDriver(), "wayland") != 0;
+}
+
 void EGLRenderer::renderFrame(AVFrame* frame)
 {
     EGLImage imgs[EGL_MAX_PLANES];