Replace deprecated -flat_namespace -undefined suppress linker flags

Use -undefined dynamic_lookup instead, which is the modern equivalent
for allowing plugin modules to resolve symbols at load time. Applied
to both Darwin and iOS targets.

Author: Marcel Hecko

CMakeLists.txt

@@ -361,21 +361,21 @@ if(${CMAKE_SYSTEM_NAME} STREQUAL Darwin)
   set(CMAKE_CXX_FLAGS
       "${CMAKE_CXX_FLAGS} -fno-common -DBSD44SOCKETS -D__DARWIN_UNIX03")
   set(CMAKE_SHARED_MODULE_CREATE_CXX_FLAGS
-      "${CMAKE_SHARED_MODULE_CREATE_CXX_FLAGS} -flat_namespace -undefined suppress -bundle"
+      "${CMAKE_SHARED_MODULE_CREATE_CXX_FLAGS} -undefined dynamic_lookup -bundle"
   )
   set(CMAKE_SHARED_MODULE_CREATE_C_FLAGS
-      "${CMAKE_SHARED_MODULE_CREATE_C_FLAGS} -flat_namespace -undefined suppress -bundle"
+      "${CMAKE_SHARED_MODULE_CREATE_C_FLAGS} -undefined dynamic_lookup -bundle"
   )
 endif(${CMAKE_SYSTEM_NAME} STREQUAL Darwin)
 
 if(${CMAKE_SYSTEM_NAME} STREQUAL iOS)
   set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -fno-common -DBSD44SOCKETS")
   set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fno-common -DBSD44SOCKETS")
   set(CMAKE_SHARED_MODULE_CREATE_CXX_FLAGS
-      "${CMAKE_SHARED_MODULE_CREATE_CXX_FLAGS} -flat_namespace -undefined suppress -bundle"
+      "${CMAKE_SHARED_MODULE_CREATE_CXX_FLAGS} -undefined dynamic_lookup -bundle"
   )
   set(CMAKE_SHARED_MODULE_CREATE_C_FLAGS
-      "${CMAKE_SHARED_MODULE_CREATE_C_FLAGS} -flat_namespace -undefined suppress -bundle"
+      "${CMAKE_SHARED_MODULE_CREATE_C_FLAGS} -undefined dynamic_lookup -bundle"
   )
   set(CMAKE_DL_LIBS ${CMAKE_DL_LIBS} gcc_eh)
 endif(${CMAKE_SYSTEM_NAME} STREQUAL iOS)