This regression has been introduced by commit 52da4da. The
info panel crashes if prettify_info() returns NULL. This happens
if Renderer property from SessionManager is empty.
https://bugzilla.gnome.org/show_bug.cgi?id=774240
Remove the references to Gallium, and the exact versions of the DRM
backend, the kernel and LLVM. Debug information can still be gathered in
plenty of other ways.
https://bugzilla.gnome.org/show_bug.cgi?id=774240