fptu: pull erthink upstream (fix license notice).
fptu: pull erthink upstream (fix license notice).

Merge commit 'd4312cf2c68bbeee3710a76f6d8bbfb7a80b2f0b'

leo-yuriev/libfpta,leo-yuriev/libfptu,leo-yuriev/libfptu,leo-yuriev/libfpta