Test new handling of library exports

[codeanticode]

Library exports are handled differently from Processing 3, due to the changes in supported platforms:

https://github.com/processing/processing4/wiki/Supported-Platforms

In particular, exports.txt file are no longer required for libraries, and the androidExports list used in Processing 3:

https://github.com/processing/processing/blob/master/app/src/processing/app/Library.java#L147

is not initialized in Processing 4:

https://github.com/processing/processing4/blob/master/app/src/processing/app/Library.java#L215

This commit https://github.com/processing/processing-android/commit/55bfe5891be4b57b091553882eaf7a6062cd8876 removes the use of the getAndroidExports() in the mode but it should be tested with a contributed library. The following one could be a good candidate:

https://github.com/irealva/Tensorflowlite-for-Processing