Wake every pipeline waiter when shader work is queued or promoted

Compiler workers and renderer waiters share g_pipelineCv. notify_one could
wake a renderer thread instead of a compiler, leaving a queued pipeline
until some later wake-up; with skip_unready_pipelines its draws stay
missing that much longer. Promoting a background build to priority now
wakes the workers too.

From upstream patchzyy/Wiicompiled 6f14bde (#244, KartPad 956d811e).

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Wg7mB8ogCWmp9GH19Uc82B

aurora-main/lib/gfx/pipeline_cache.cpp

@@ -426,6 +426,7 @@ static PendingPipeline* touch_pending_pipeline(PipelineRef hash, bool prioritize
 
   g_priorityPipelines.emplace_back(std::move(*backgroundIt));
   g_backgroundPipelines.erase(backgroundIt);
+  g_pipelineCv.notify_all();
   return &g_priorityPipelines.back();
 }
 
@@ -566,7 +567,8 @@ static PipelineRef find_pipeline_impl(ShaderType type, const PipelineConfig& con
   }
 
   if (notifyWorker) {
-    g_pipelineCv.notify_one();
+    // Compiler workers and renderer waiters share this condition variable.
+    g_pipelineCv.notify_all();
   }
   if (notifyWaiters) {
     g_pipelineCv.notify_all();