Switch demo code to copy source into home directory.
Switch demo code to copy source into home directory.

For some reason this seems to stop compilation working. It's possible /tmp is treated separately.

PiperOrigin-RevId: 461649829
Change-Id: I839ba4c8540c767fc0f80dfd6b17f68a1358ac4b

google/jni-bind,google/jni-bind,google/jni-bind,google/jni-bind