Don't export dl library when not used (backport #33) (#35)

* micro-ROS Kilted patch

Signed-off-by: Antón Casas <antoncasas@eprosima.com>

* Don't export dl library when not used (#33)

(cherry picked from commit 1f5e5f1)

---------

Signed-off-by: Antón Casas <antoncasas@eprosima.com>
Co-authored-by: Antón Casas <antoncasas@eprosima.com>
Co-authored-by: Błażej Sowa <bsowa123@gmail.com>

Author: 3 people

CMakeLists.txt

@@ -617,7 +617,10 @@ endif()
 
 # Export old-style CMake variables
 ament_export_include_directories("include/${PROJECT_NAME}")
-ament_export_libraries(${PROJECT_NAME} ${CMAKE_DL_LIBS})
+
+if(NOT RCUTILS_NO_FILESYSTEM)
+  ament_export_libraries(${PROJECT_NAME} ${CMAKE_DL_LIBS})
+endif()
 
 # Export modern CMake targets
 ament_export_targets(${PROJECT_NAME})