Ignore JNI driver files for Android Hydra core

CMakeLists.txt

@@ -388,9 +388,10 @@ if(ENABLE_VULKAN)
     set(ALL_SOURCES ${ALL_SOURCES} ${RENDERER_VK_SOURCE_FILES})
 endif()
 
-if(ANDROID)
+if(ANDROID AND NOT BUILD_HYDRA_CORE)
     set(HEADER_FILES ${HEADER_FILES} include/jni_driver.hpp)
     set(ALL_SOURCES ${ALL_SOURCES} src/jni_driver.cpp)
+    target_compile_definitions(Alber PRIVATE PANDA3DS_FRONTEND_PANDROID=1)
 endif()
 
 if(BUILD_HYDRA_CORE)