Make clean fails for unpackedTarballs in subpath firebird

[Regina Henschel]

Hi all,

if I use /opt/lo/bin/make clean it stops with the error message
"rm: das Entfernen von 
'D:/Build_ODF_layers/core/workdir/UnpackedTarball/firebird/gen/Debug/firebird' 
ist nicht möglich: Directory not empty"
And indeed it has a 0Byte file fb_trace_wj10i8 in 
unpackedTarball/firebird/gen/Debug/firebird.

I can delete the file manually in Windows explorer. But I think it is an 
error. I write here, because I don't find a suitable category in Bugzilla.

Kind regards
Regina