Include likely-adjusted uiLanguages for the system locale

QLocale::uiLanguages() on the system locale uses whatever the system
locale's query(QSystemLocale::UILanguages,...) returns. On Android,
this is just a list of locales. However, for non-system locales, we
also include some results of removing likely sub-tags from the locale
name, where equivalent. Thus zh-CN would also get zh and zh-Hans-CN
added to it; however, if the system locale is zh-Hans-CN, the shorter
forms are omitted. So post-process the system locale list in the same
way, albeit tweaked to avoid duplicates and rearranged so that we can
insert likely-adjusted entries between what they adjust and what
followed it.

Added QLocalePrivate::rawName() in the process, since it looks likely
to be useful in other contexts (and I needed its value): it just joins
such tags as are non-Any. This, however, uses QByteArrayList, so added
that (it's small) to the bootstrap library and qmake.

This follows up on commit 8796e3016fae1672e727e2fa4e48f671a0c667ba.

[ChangeLog][QtCore][QLocale] The system locale's UI languages list now
includes, as for that of an ordinary locale, the results of adding
likely sub-tags from each locale name, and of removing some, where
this doesn't change which locale is specified. This gives searches for
translation files a better chance of finding a suitable file.

Fixes: QTBUG-75413
Change-Id: Iaafd79aac6a0fdd5f44aed16e445e84a2267c9da
Reviewed-by: Paul Wicking <paul.wicking@qt.io>
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>

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