If debug information support is enabled in the mentioned project, some packages
will not be built due to a conflict when collecting debug information for
native and cross-compiled packages.

How to reproduce:

1. branch one of the following package into a local project
  mingw32-libqt4
  mingw32-libqt4-static
  mingw32-libqt5-qtbase
  mingw32-libqt5-qtdeclarative
  mingw32-libqt5-qttools
2. enable debug info support at the created project

What happens:
The build fails with "error: Installed (but unpackaged) file(s) found:"
  /usr/lib/debug/...

What is expected:
The build should not fail with debug info support enabled at project or package
level

Adding debug information at the project level was originally proposed as a
workaround for a non-stripping problem with the cross-gcc package reported at
https://bugzilla.opensuse.org/show_bug.cgi?id=1116889.