qwt-qt5: Fix multilib install
qwt-qt5: Fix multilib install

| ERROR: qwt-qt5-6.1.3-r0 do_package: QA Issue: qwt-qt5: Files/directories were installed but not shipped in any package:
|   /usr/lib/libqwt.so.6
|   /usr/lib/libqwt.so.6.1
|   /usr/lib/libqwt.so
|   /usr/lib/libqwt.so.6.1.3
|   /usr/lib/pkgconfig
|   /usr/lib/pkgconfig/Qt5Qwt6.pc
| Please set FILES such that these items are packaged. Alternatively if they are unneeded, avoid installing them or delete them within do_install.

Signed-off-by: Andreas Müller <d72a15aaaca3a7afa855175c72dc8d2e05931e32@gmail.com>

sapiippo/meta-qt5,schnitzeltony/meta-qt5,schnitzeltony/meta-qt5,meta-qt5/meta-qt5,meta-qt5/meta-qt5,sapiippo/meta-qt5