[Bug 268652] Qt5: Some apps fails to start after upgrading to 5.15.8

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=268652

--- Comment #21 from Tomoaki AOKI <junchoon@dec.sakura.ne.jp> ---
(In reply to Bengt Ahlgren from comment #19)

Tried.

% env QT_DEBUG_PLUGINS=1 vlc
VLC media player 3.0.18 Vetinari (revision fb4ef23dde67)
[000000082953e060] main libvlc: vlcはデフォルトのインターフェースで実行しています。インターフェースのない vlc
を使用するには'cvlc'を使用してください。
QFactoryLoader::QFactoryLoader() checking directory path
"/usr/local/bin/platforms" ...
qt.qpa.plugin: Could not find the Qt platform plugin "xcb" in ""
This application failed to start because no Qt platform plugin could be
initialized. Reinstalling the application may fix this problem.

zsh: abort (core dumped)  env QT_DEBUG_PLUGINS=1 vlc
% lldb --core ~/vlc.core --file /usr/local/bin/vlc
(lldb) target create "/usr/local/bin/vlc" --core "/home/junchoon/vlc.core"
Core file '/home/junchoon/vlc.core' (x86_64) was loaded.
(lldb) bt
* thread #1, name = 'vlc', stop reason = signal SIGABRT
  * frame #0: 0x00000008218b76fa libc.so.7`__sys_thr_kill + 10
    frame #1: 0x000000082182c624 libc.so.7`__raise + 52
    frame #2: 0x00000008218e261c libc.so.7`abort + 76
    frame #3: 0x0000000866667679 libQt5Core.so.5`___lldb_unnamed_symbol7134 + 9
    frame #4: 0x000000086666c1e2 libQt5Core.so.5`QMessageLogger::fatal(char
const*, ...) const + 216
    frame #5: 0x0000000862dd0d49
libQt5Gui.so.5`QGuiApplicationPrivate::createPlatformIntegration() + 6681
    frame #6: 0x0000000862dd0d70
libQt5Gui.so.5`QGuiApplicationPrivate::createEventDispatcher() + 32
    frame #7: 0x00000008668353a6
libQt5Core.so.5`QCoreApplicationPrivate::init() + 1510
    frame #8: 0x0000000862dcb36a libQt5Gui.so.5`QGuiApplicationPrivate::init()
+ 42
    frame #9: 0x0000000863e975be libQt5Widgets.so.5`QApplicationPrivate::init()
+ 14
    frame #10: 0x0000000861ec4af0 libqt_plugin.so`___lldb_unnamed_symbol4088 +
208
    frame #11: 0x0000000861ec49b6 libqt_plugin.so`___lldb_unnamed_symbol4086 +
38
    frame #12: 0x00000008228859ae libthr.so.3`___lldb_unnamed_symbol556 + 318
(lldb)

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