package/qt5base: add upstream security patch for LTS variant

package/qt5base: add upstream security patch for LTS variant

Fixed the following security issue:

- CVE-2020-0569: QPluginLoader in Qt versions 5.0.0 through 5.13.2 would
  search for certain plugins first on the current working directory of the
  application, which allows an attacker that can place files in the file
  system and influence the working directory of Qt-based applications to
  load and execute malicious code.  This issue was verified on macOS and
  Linux and probably affects all other Unix operating systems.  This issue
  does not affect Windows.

For details, see the advisory:
https://www.openwall.com/lists/oss-security/2020/01/30/1

Signed-off-by: Peter Seiderer <ps.report@gmx.net>
[Peter: extend commit message]
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>