Do not enforce building as a shared library, respect BUILD_SHARED_LIBS

Author: meyerj

CMakeLists.txt

@@ -219,7 +219,10 @@ custom_executable(simple_bridge "src/simple_bridge.cpp"
   ROS1_DEPENDENCIES
   TARGET_DEPENDENCIES "std_msgs")
 
-add_library(${PROJECT_NAME} SHARED
+if(NOT DEFINED BUILD_SHARED_LIBS)
+  set(BUILD_SHARED_LIBS ON)
+endif()
+add_library(${PROJECT_NAME}
   "src/builtin_interfaces_factories.cpp"
   "src/convert_builtin_interfaces.cpp"
   "src/bridge.cpp"