probably since qt6 migration many symlinks inside the .app in bundled PyQt were broken:
```
$ cp -r $HOME/electrum/dist/Electrum.app Electrum-ghost3.app
cp: /Users/vagrant/electrum/dist/Electrum.app/Contents/Resources/PyQt6/Qt6/lib/QtMultimediaQuick.framework/QtMultimediaQuick: No such file or directory
cp: /Users/vagrant/electrum/dist/Electrum.app/Contents/Resources/PyQt6/Qt6/lib/QtQuickTimeline.framework/QtQuickTimeline: No such file or directory
cp: /Users/vagrant/electrum/dist/Electrum.app/Contents/Resources/PyQt6/Qt6/lib/QtQuickControls2.framework/QtQuickControls2: No such file or directory
```
We were stripping out lots of datas/binaries from Qt from the mac build artifact, leaving behind dangling symlinks.
Instead of adding more hacks on top of the current hacks to also rm the dangling links, I tried to clean up this blacklisting.
There was no issue re the Windows build, no symlinks there, but I like to keep these two spec files in sync.
-----
Some numbers:
- mac:
- without any exclusions at all, the mac .dmg is 80 MiB.
- with these exclusions it is 57 MiB.
- win:
- (haven't built without exclusions.)
- with the previous stripping strategy, exes were 68M/68M/50M
- with these exclusions, exes are 66M/66M/50M
