Added tweakme options to CMakeLists.txt

tests/CMakeLists.txt

@@ -24,7 +24,6 @@ set(SPDLOG_UTESTS_SOURCES
     test_sink.h
     test_fmt_helper.cpp
   	test_stdout_api.cpp
-    test_dup_filter.cpp
 	test_backtrace.cpp
 	test_create_dir.cpp)
 
@@ -36,6 +35,13 @@ if(systemd_FOUND)
 	list(APPEND SPDLOG_UTESTS_SOURCES test_systemd.cpp)
 endif()
 
+if(NOT SPDLOG_NO_DATETIME)
+	list(APPEND SPDLOG_UTESTS_SOURCES test_dup_filter.cpp)
+endif()
+
+
+
+
 enable_testing()
 
 function(spdlog_prepare_test test_target spdlog_lib)