bug#69800: kcalendarcore is a time bomb

[Vivien Kraus via Bug reports for GNU Guix]

Dear Guix,

Kcalendarcore does not build anymore. According to CI, it stopped
working this march, on gnome-team and rust-branch (I can’t build it
either on master).

http://ci.guix.gnu.org/search?query=kcalendarcore

Best regards,

Vivien