This is needed to copy the .qdocconf files from that directory to
QT_INSTALL_DOCS.
Task-number: QTBUG-74391
Change-Id: Ia73d5c38c3c9588820401e8098b01f09e63292e4
Reviewed-by: Paul Wicking <paul.wicking@qt.io>
that required factoring out the docs installation to a separate project,
as COPIES doesn't work in subdirs projects. it's cleaner this way
anyway.
Change-Id: I594f3ecdae67417511034ab993904c962b86b282
Reviewed-by: Topi Reiniö <topi.reinio@theqtcompany.com>