gh: core-as-lib: also compile cpp files in api folder

Author: facchinm

Diff for: cores/arduino/CMakeLists.txt

@@ -9,6 +9,14 @@ zephyr_sources(zephyrCommon.cpp)
 zephyr_sources(USB.cpp)
 zephyr_sources(itoa.cpp)
 
+zephyr_sources(api/CanMsg.cpp)
+zephyr_sources(api/CanMsgRingbuffer.cpp)
+zephyr_sources(api/Common.cpp)
+zephyr_sources(api/IPAddress.cpp)
+zephyr_sources(api/Print.cpp)
+zephyr_sources(api/Stream.cpp)
+zephyr_sources(api/String.cpp)
+
 if(DEFINED CONFIG_ARDUINO_ENTRY)
 zephyr_sources(main.cpp)
 endif()