fix: address review issues from MICRO_PIP migration

- piconditionvar.h: remove phantom wait(lk, timeout) stubs not in real class
- pithread.h: remove duplicate #ifndef PIP_NO_THREADS guard
- piscreendrawer/tile/tiles.cpp: remove duplicate #if !defined(PICO_SDK)
- cmake/FindPIP.cmake: replace PIP_MICRO with PIP_EMBEDDED

libs/main/thread/piconditionvar.h

@@ -184,8 +184,6 @@ public:
 	void wait(PIMutex &, std::function<bool()>) {}
 	bool waitFor(PIMutex &, PISystemTime) { return false; }
 	bool waitFor(PIMutex &, PISystemTime, std::function<bool()>) { return false; }
-	bool wait(PIMutex &, PISystemTime) { return true; }
-	bool wait(PIMutex &, ullong) { return true; }
 	void notifyOne() {}
 	void notifyAll() {}
 };

libs/main/thread/pithread.h

@@ -44,7 +44,6 @@
 class PIThread;
 
 #ifndef PIP_NO_THREADS
-#  ifndef PIP_NO_THREADS
 class PIIntrospectionThreads;
 
 class PIP_EXPORT __PIThreadCollection: public PIObject {
@@ -75,7 +74,6 @@ public:
 };
 
 static __PIThreadCollection_Initializer__ __PIThreadCollection_initializer__;
-#  endif // PIP_NO_THREADS
 
 //! \~english Callback executed by %PIThread with the current \a data() pointer.
 //! \~russian Обратный вызов, который %PIThread выполняет с текущим указателем \a data().