semaphore_t, RSX fixes

1) GS_LOCK_WAIT_FLUSH semaphore eliminated
2) GS_LOCK_WAIT_FLIP semaphore left unused
3) cellRescSetWaitFlip/cellGcmSetWaitFlip purged: they don't wait for
flip, it's a nonsense, they only generate some RSX command
4) Semaphores rewritten

Utilities/Semaphore.h

@@ -0,0 +1,37 @@
+#pragma once
+
+class semaphore_t
+{
+	// semaphore mutex
+	std::mutex m_mutex;
+
+	// semaphore condition variable
+	std::condition_variable m_cv;
+
+	struct sync_var_t
+	{
+		u32 value; // current semaphore value
+		u32 waiters; // current amount of waiters
+	};
+
+	// current semaphore value
+	atomic_t<sync_var_t> m_var;
+
+public:
+	// max semaphore value
+	const u32 max_value;
+
+	semaphore_t(u32 max_value = 1, u32 value = 0)
+		: m_var({ value, 0 })
+		, max_value(max_value)
+	{
+	}
+
+	bool try_wait();
+
+	bool try_post();
+
+	void wait();
+
+	bool post_and_wait();
+};