cmake: make ASIO_STANDALONE and MSGPACK_NO_BOOST public definitions

Avoids users to try using BOOST.

Change-Id: Id54daee8d187979ee2e96cb07a053ebd85baa3ed

CMakeLists.txt

@@ -262,6 +262,10 @@ target_compile_definitions(${PROJECT_NAME} PRIVATE
     ASIO_STANDALONE
     MSGPACK_NO_BOOST
 )
+target_compile_definitions(${PROJECT_NAME} PUBLIC
+    ASIO_STANDALONE
+    MSGPACK_NO_BOOST
+)
 if (JAMI_VIDEO)
     target_compile_definitions(${PROJECT_NAME} PRIVATE ENABLE_VIDEO)
     if (JAMI_VIDEO_ACCEL)