Deploy also system libraries in AppImage

Include also system libraries in the AppImage. This ensures that users
do not have to install some otherwise outdated libraries like legacy
libpng12.
17 jobs for linuxdeployqt-debug in 10 minutes and 15 seconds (queued for 20 seconds)
latest
Status Job ID Name Coverage
  Images
manual #44076814
allowed to fail manual
build_image_fedora
manual #44076815
allowed to fail manual
build_image_fedora_system
manual #44076816
allowed to fail manual
build_image_ubuntu
manual #44076817
allowed to fail manual
build_image_win32
manual #44076818
allowed to fail manual
build_image_win64
 
  Build
passed #44076819
linux_builtin

00:03:42

passed #44076820
linux_system

00:03:54

manual #44076826
macos allowed to fail manual
macos
passed #44076821
ubuntu_appimage

00:08:12

passed #44076822
win32_build

00:04:02

manual #44076824
windows allowed to fail manual
win32_vs_build
passed #44076823
win64_build

00:03:59

manual #44076825
windows allowed to fail manual
win64_vs_build
 
  Installer
passed #44076827
win32_installer

00:02:02

manual #44076829
allowed to fail manual
win32_vs_installer
passed #44076828
win64_installer

00:01:50

manual #44076830
allowed to fail manual
win64_vs_installer