Add minimalistic Qt configuration for Quick appsHEADdev

This commit adds size-optimized Qt configuration for Qt
Quick apps. By having a CI configuration helps in ensuring
that the configuration doesn't break over time.

The goal of the configurations is to provide a size-optimized
build while typical Quick applications should still work. The
latter point was checked by checking several example apps:
Coffeemachine, Calqlatr, Gallery, Colorpalette, and few
smaller test applications. Space-savings are in 60%
ballpark when comparing optimized with non-optimized
static builds. Optimizations also include stripping the
binaries where applicable.

Tested platforms: iOS, macOS, Windows, Linux, WebAssembly
and Android. Autotests are compiled and run only on one
platform (macOS) to preserve CI compute. Configurations
are 'Insignificant' to avoid interruptions - this should
be changed once proven stable.

Notably all except Android builds are static builds;
static build optimizations (LTO in particular) are very
powerful in optimizing size. Qt for Android OTOH
does not support static builds.

There are more features and options that user can disable
for further space savings. Prior art for Linux show-cases
taking the optimizations further (QTBUG-117638).

This commit is preceded by numerous compilation fixes to
qtbase and qtdeclarative (now merged).

Fixes: QTBUG-134299
Change-Id: Iaec0aea3e9d475220161ca8d00f0ec15eaa637a9
Reviewed-by: Tor Arne Vestbø <[email protected]>
Reviewed-by: Assam Boudjelthia <[email protected]>
Reviewed-by: Simo Fält <[email protected]>

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