Add missing LIBS and LIBPATH

SConstruct

@@ -23,6 +23,9 @@ if env["platform"] == "macos":
         ),
         source=sources,
     )
+    env.Append(LIBS=['LeapC'])
+    # I am not sure about this path. Replace this with the path where you can find libLeapC.dylib
+    env.Append(LIBPATH = ['/usr/lib/ultraleap-hand-tracking-service'])
 else:
     library = env.SharedLibrary(
         "demo/addons/godot_ultraleap_plugin/bin/libgdultraleap{}{}".format(env["suffix"], env["SHLIBSUFFIX"]),