adjust QMimeDatabase implementation

Origin: upstream, https://code.qt.io/cgit/qt/qtbase.git/commit/?id=0cbbba2aa5b47224
Last-Update: 2021-06-12

When multiple globs match, and the result from magic sniffing is
unrelated to any of those globs, globs have priority and one of them
should be picked up.

Gbp-Pq: Name mime_globs.diff

qtbase-opensource-src (5.15.7+dfsg-3) unstable; urgency=medium

  * Backport upstream patch to fix deletion order in QImageReader/Writer
    destructors.

[dgit import unpatched qtbase-opensource-src 5.15.7+dfsg-3]

Import qtbase-opensource-src_5.15.7+dfsg-3.debian.tar.xz

[dgit import tarball qtbase-opensource-src 5.15.7+dfsg-3 qtbase-opensource-src_5.15.7+dfsg-3.debian.tar.xz]

Import qtbase-opensource-src_5.15.7+dfsg.orig.tar.xz

[dgit import orig qtbase-opensource-src_5.15.7+dfsg.orig.tar.xz]