Set the GDK backend to fix the crash with wayland

[Daniel Leidert]

Hi Jean,

I hope you can help me out here. As you know some of the binaries crash with
Wayland which is the default for many Linux distributions. Setting the
GDK_BACKEND to x11 "fixes" the problem. Now I have some possible ways to use
this:

1) Use  a script and set GDK_BACKEND and then call the binary
2) Use g_setenv() in the source code or
3) Use gdk_set_allowed_backends ("x11,*") and try the x11 backend first.

I think 3) seems to be a good choice to avoid the crash. Where would be the
best place to set this in the source?

Regards, Daniel