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

cmake/FindPIP.cmake

@@ -72,7 +72,7 @@ if (NOT BUILDING_PIP)
 			find_library(PTHREAD_LIBRARY pthread)
 			find_library(UTIL_LIBRARY util)
 			set(_PIP_ADD_LIBS_ ${PTHREAD_LIBRARY} ${UTIL_LIBRARY})
-			if((NOT DEFINED ENV{QNX_HOST}) AND (NOT APPLE) AND (NOT PIP_MICRO))
+			if((NOT DEFINED ENV{QNX_HOST}) AND (NOT APPLE) AND (NOT PIP_EMBEDDED))
 				find_library(RT_LIBRARY rt)
 				list(APPEND _PIP_ADD_LIBS_ ${RT_LIBRARY})
 			endif()