QNAM: work around QObject finicky orphan cleanup details

Origin: upstream, https://code.qt.io/cgit/qt/qtbase.git/commit/?id=0807f16eb407eaf8
Last-Update: 2021-01-26

Gbp-Pq: Name qnam_connect_memory_leak.diff

Avoid use-after-free in QXcbConnection::initializeScreens()

Origin: upstream, https://code.qt.io/cgit/qt/qtbase.git/commit/?id=86b8c5c3f32c2457
Last-Update: 2020-11-23

Gbp-Pq: Name xcb_screens_uaf.patch

qtbase-opensource-src (5.15.2+dfsg-14) unstable; urgency=medium

  * Backport four upstream commits to fix massive memory consumption when
    rendering specially crafted SVG files (CVE-2021-38593, LP: #1950193).
  * Update symbols files from buildds’ logs.
  * Override some source-is-missing and unpack-message-for-orig warnings.

[dgit import unpatched qtbase-opensource-src 5.15.2+dfsg-14]

Import qtbase-opensource-src_5.15.2+dfsg-14.debian.tar.xz

[dgit import tarball qtbase-opensource-src 5.15.2+dfsg-14 qtbase-opensource-src_5.15.2+dfsg-14.debian.tar.xz]

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

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