fptu: pull erthink upstream (workaround for Coverity Scan).
fptu: pull erthink upstream (workaround for Coverity Scan).

Merge commit '4ac59f7cc8df59f0b131f8a81c32e026fc3963a4'

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