I've been seeing segfaults when opening m4a files with kid3. I have `kid3 3.8.6-1` and `libmp4v2 4.1.4-1` installed.

The top of the gdb backtrace looks something like:
```
Thread 1 "kid3" received signal SIGSEGV, Segmentation fault.
0x0000555555574010 in ?? ()
(gdb) bt
#0 0x0000555555574010 in ()
#1 0x00007fffd04f5f86 in () at /usr/lib/libmp4v2.so.2
#2 0x00007fffd04f8e59 in () at /usr/lib/libmp4v2.so.2
#3 0x00007fffd04f9d29 in () at /usr/lib/libmp4v2.so.2
#4 0x00007fffd04eec57 in MP4Read () at /usr/lib/libmp4v2.so.2
#5 0x00007fffd05e38e8 in () at /usr/lib/kid3/plugins/libmp4v2metadata.so
#6 0x00007ffff79c554c in FileProxyModel::readTagsFromTaggedFile(TaggedFile*) () at /usr/lib/kid3/libkid3-core.so
#7 0x00007ffff79f56bb in TaggedFileSelection::addTaggedFile(TaggedFile*) () at /usr/lib/kid3/libkid3-core.so
#8 0x00007ffff79d5115 in Kid3Application::addTaggedFilesToSelection(QList<QPersistentModelIndex> const&, bool) () at /usr/lib/kid3/libkid3-core.so
#9 0x00007ffff79d9087 in Kid3Application::selectedTagsToFrameModels(QItemSelection const&) () at /usr/lib/kid3/libkid3-core.so
#10 0x00007ffff7f6e83e in BaseMainWindowImpl::applySelectionChange(QItemSelection const&, QItemSelection const&) () at /usr/lib/kid3/libkid3-gui.so
```

I think this is a result of libmp4v2 upstream breaking the ABI of `MP4Read` in this commit: https://github.com/TechSmith/mp4v2/commit/263719465a1c1fbe6d240b8d154da71003ce3230

(adding a parameter with a default value breaks ABI in C++).

Rebuilding kid3 is enough to fix this issue for me. (I guess upstream should have bumped the soname.) Other packages that depend on libmp4v2 might also need to be rebuilt.