tests: properly disable shutdown test for Cygwin

platforms/posix/cmake/sitl_tests.cmake

@@ -46,7 +46,6 @@ if (CMAKE_SYSTEM_NAME STREQUAL "CYGWIN")
 	list(REMOVE_ITEM tests
 		hysteresis # Intermittent timing fails.
 		uorb
-		shutdown # A mystery why it fails.
 	)
 endif()
 
@@ -85,20 +84,23 @@ set_tests_properties(mavlink PROPERTIES FAIL_REGULAR_EXPRESSION "mavlink FAILED"
 set_tests_properties(mavlink PROPERTIES PASS_REGULAR_EXPRESSION "mavlink PASSED")
 sanitizer_fail_test_on_error(mavlink)
 
-# Shutdown test
-add_test(NAME shutdown
-	COMMAND ${PX4_SOURCE_DIR}/Tools/sitl_run.sh
-		$<TARGET_FILE:px4>
-		none
-		none
-		test_shutdown
-		${PX4_SOURCE_DIR}
-		${PX4_BINARY_DIR}
-	WORKING_DIRECTORY ${SITL_WORKING_DIR})
+# A mystery why this fails on Cygwin currently.
+if(NOT CMAKE_SYSTEM_NAME STREQUAL "CYGWIN")
+	# Shutdown test
+	add_test(NAME shutdown
+		COMMAND ${PX4_SOURCE_DIR}/Tools/sitl_run.sh
+			$<TARGET_FILE:px4>
+			none
+			none
+			test_shutdown
+			${PX4_SOURCE_DIR}
+			${PX4_BINARY_DIR}
+		WORKING_DIRECTORY ${SITL_WORKING_DIR})
 
-#set_tests_properties(shutdown PROPERTIES FAIL_REGULAR_EXPRESSION "shutdown FAILED")
-set_tests_properties(shutdown PROPERTIES PASS_REGULAR_EXPRESSION "Shutting down")
-sanitizer_fail_test_on_error(shutdown)
+	#set_tests_properties(shutdown PROPERTIES FAIL_REGULAR_EXPRESSION "shutdown FAILED")
+	set_tests_properties(shutdown PROPERTIES PASS_REGULAR_EXPRESSION "Shutting down")
+	sanitizer_fail_test_on_error(shutdown)
+endif()
 
 # Dynamic module loading test
 add_test(NAME dyn