QTextCodec: port to QRecursiveMutex

Write a local mutex locker for DRY. Use qt_unique_lock(Mutex*) because
we do not intend to add a QRecursiveMutexLocker and by Qt 6, the
current work-around where QMutexLocker works for QRecursiveMutex, too,
will be gone.

Could have used qt_scoped_lock, because no premature unlock() calls
are present, but it turns out the code attempts to take the mutex
after it's destroyed by Q_GLOBAL_STATIC, so we need QMutexLocker
compat, thus qt_unique_lock(Mutex*) instead of qt_scoped_lock(Mutex&).

Need to use decltype and using because auto doesn't work for NSDMs.

Change-Id: I8b0f8a3067f0a412279d075cb959105e485789cd
Reviewed-by: Lars Knoll <lars.knoll@qt.io>

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