Mali400's GL_RENDERER string used for workarounds

Hi and thank you for developing Qt!

On my Pinephone (SoC Allwinner A64 [1]) with Mobian testing (Qt 5.15.4), I have noticed that GL_RENDERER string in glxinfo and in system logs is "Mali400".
In Qt, rendererString is indeed compared with "Mali-4xx", e.g.
qstrncmp(rendererString, "Mali-4xx", 6) == 0 // Mali-400, Mali-450
occuring at least twice [2]: should not those be aligned?

[1] https://linux-sunxi.org/A64
[2] https://codereview.qt-project.org/q/Mali-4xx

system logs while starting Plasma mobile session:
ago 08 21:08:10 mobian kwin_wayland_wrapper[1373]: OpenGL vendor string: lima
ago 08 21:08:10 mobian kwin_wayland_wrapper[1373]: OpenGL renderer string: Mali400
ago 08 21:08:10 mobian kwin_wayland_wrapper[1373]: OpenGL version string: 2.1 Mesa 22.0.5
ago 08 21:08:10 mobian kwin_wayland_wrapper[1373]: OpenGL shading language version string: 1.20
ago 08 21:08:10 mobian kwin_wayland_wrapper[1373]: Driver: Unknown
ago 08 21:08:10 mobian kwin_wayland_wrapper[1373]: GPU class: Unknown
ago 08 21:08:10 mobian kwin_wayland_wrapper[1373]: OpenGL version: 2.1
ago 08 21:08:10 mobian kwin_wayland_wrapper[1373]: GLSL version: 1.20
ago 08 21:08:10 mobian kwin_wayland_wrapper[1373]: Mesa version: 22.0.5
ago 08 21:08:10 mobian kwin_wayland_wrapper[1373]: Linux kernel version: 5.15
ago 08 21:08:10 mobian kwin_wayland_wrapper[1373]: Requires strict binding: no
ago 08 21:08:10 mobian kwin_wayland_wrapper[1373]: GLSL shaders: yes
ago 08 21:08:10 mobian kwin_wayland_wrapper[1373]: Texture NPOT support: yes
ago 08 21:08:10 mobian kwin_wayland_wrapper[1373]: Virtual Machine: no