Add missing dependency to CMake target

Fix #4

CMakeLists.txt

@@ -86,7 +86,7 @@ ADD_CUSTOM_COMMAND(
 )
 
 # Add the native library to the executable jar
-ADD_CUSTOM_TARGET(Lib_to_jar ALL DEPENDS AlienFX Images_to_jar)
+ADD_CUSTOM_TARGET(Lib_to_jar ALL DEPENDS AlienFX Images_to_jar Alien${ARCH})
 ADD_CUSTOM_COMMAND(
    COMMAND ${Java_JAR_EXECUTABLE}
    ARGS    uf ${AlienFX_jar} -C ${CMAKE_BINARY_DIR} lib/${NATIVE_LIBRARY_NAME}