Windows build failed to build new aqbanking 5.7.8

[Robert Fewell]

Was looking to see if the new version of aqbabking 5.7.8 fixes combobox
issue but it fails to build. The new Gwenhywfar 4.20 builds OK and this has
the gtk3 stuff in it.
There were some errors about creating symlinks due to the files already
being there which I suppose one can ignore but later it fails.
Looked at the build server logs and it has the same failure.

Bob