build fixes for GCC 11

Origin: upstream, commits:
 https://code.qt.io/cgit/qt/qtdeclarative.git/commit/?id=eb6525f126f680f9
 https://code.qt.io/cgit/qt/qtdeclarative.git/commit/?id=367293b18ab0d0a0
Last-Update: 2021-08-18

Gbp-Pq: Name gcc_11.patch

fix QML property cache leaks of delegate items

Origin: upstream, https://code.qt.io/cgit/qt/qtdeclarative.git/commit/?id=b2862e2bd84d651c
Last-Update: 2021-01-26

The delegate items are destroyed through an event loop by a call to a
deleteLater(). This, however, doesn't work when the application is
in the process of exiting and the event loop is already closed (i.e.
we're in a stack unwinding part that starts after app.exec()).

Combat this situation by setting a parent of the to-be-deleted object
to some QObject that will be destroyed e.g. QCoreApplication::instance()
before the program finishes. As QObjects clean their children on
destruction, this will make sure that we cleanup the previously leaking
thing regardless of the event loop.

Gbp-Pq: Name fix_qml_property_cache_leaks.patch

The qmltime should be a tool, not a normal executable or an app.

Origin: upstream, https://code.qt.io/cgit/qt/qtdeclarative.git/commit/?h=5.15&id=30c7a6c6a8742648
Last-Update: 2021-01-18

Gbp-Pq: Name qmltime-tool.patch

qtdeclarative-opensource-src (5.15.2+dfsg-8) unstable; urgency=medium

  * Include <limits> in Yarr.h to fix FTBFS with GCC 11 on arm64 and i386.

[dgit import unpatched qtdeclarative-opensource-src 5.15.2+dfsg-8]

Import qtdeclarative-opensource-src_5.15.2+dfsg-8.debian.tar.xz

[dgit import tarball qtdeclarative-opensource-src 5.15.2+dfsg-8 qtdeclarative-opensource-src_5.15.2+dfsg-8.debian.tar.xz]

Import qtdeclarative-opensource-src_5.15.2+dfsg.orig.tar.xz

[dgit import orig qtdeclarative-opensource-src_5.15.2+dfsg.orig.tar.xz]