macOS/Qt5: Fix KRA/ORA

[jdpurcell]

This time thankfully not a regression; I don't believe this has ever worked. The "install name" for KArchive is different depending on whether we built with Qt5 or Qt6, so the install_name_tool command was only able to find/change the specified name in the Qt6 builds. This resulted in the legacy macOS qView being unable to load KRA/ORA files. I ran this fix through my Actions pipeline and can verify the names are correct in both cases now, e.g.:

otool -l kimg_kra-qt5.so | grep Archive
         name @rpath/libKF5Archive.5.dylib (offset 24)

otool -l kimg_kra-qt6.so | grep Archive
         name @rpath/libKF5Archive.5.dylib (offset 24)
         name @rpath/libKF5Archive.5.dylib (offset 24)

(Universal binary hence the two names in the Qt6 build).

By the way, this is a little test suite of images I gathered to test a lot (but not all) of the KImageFormats decoders. There's only one file in there you won't be able to open (.pxr) since the decoder is only in KDE Frameworks 6 (I updated my fork to that a while back; can PR eventually but probably not worth focusing on right now).

[jurplel]

Perfect, thank you!