don't go looking for librt

Index: src/downloader/lib/src/lsl/lslunitsync/CMakeLists.txt
--- src/downloader/lib/src/lsl/lslunitsync/CMakeLists.txt.orig
+++ src/downloader/lib/src/lsl/lslunitsync/CMakeLists.txt
@@ -26,9 +26,9 @@ if(ADD_WXCONVERT)
 	target_compile_definitions(lsl-unitsync PRIVATE -DHAVE_WX)
 endif()
 
-if(UNIX AND NOT MINGW AND NOT APPLE)
-	find_library(RT_LIBRARY rt)
-endif()
+#if(UNIX AND NOT MINGW AND NOT APPLE)
+#	find_library(RT_LIBRARY rt)
+#endif()
 
 find_package(Threads REQUIRED)
 if(CMAKE_USE_PTHREADS_INIT)
