disable librt detection

Index: test/CMakeLists.txt
--- test/CMakeLists.txt.orig
+++ test/CMakeLists.txt
@@ -5,15 +5,15 @@ endif ()
 # defines spring_test_compile_fail macro
 include(${CMAKE_CURRENT_SOURCE_DIR}/tools/CompileFailTest/CompileFailTest.cmake)
 
-if    (UNIX AND (NOT APPLE) AND (NOT MINGW))
-	find_library(REALTIME_LIBRARY rt)
-
-	if    (PREFER_STATIC_LIBS AND NOT EXISTS "${REALTIME_LIBRARY}")
-		message(FATAL_ERROR "librt.[so|a] not found! Needed by std::chrono when statically linked!")
-	endif ()
-else ()
+#if    (UNIX AND (NOT APPLE) AND (NOT MINGW))
+#	find_library(REALTIME_LIBRARY rt)
+#
+#	if    (PREFER_STATIC_LIBS AND NOT EXISTS "${REALTIME_LIBRARY}")
+#		message(FATAL_ERROR "librt.[so|a] not found! Needed by std::chrono when statically linked!")
+#	endif ()
+#else ()
 	set(REALTIME_LIBRARY "")
-endif ()
+#endif ()
 
 include_directories(${CMAKE_BINARY_DIR}/src-generated/engine)
 
