Bug#1100147: marco FTBFS on 32-bit with 64-bit time_t with gcc 14

[Bastian Germann]

Control: tags -1 patch
Control: forwarded -1 https://cgit.freedesktop.org/startup-notification/commit/?id=a7e49fefde18ea8d5bada8096d32f23bcfb5a6dc

Upstream has fixed this with
https://cgit.freedesktop.org/startup-notification/commit/?id=a7e49fefde18ea8d5bada8096d32f23bcfb5a6dc
and
https://cgit.freedesktop.org/startup-notification/commit/?id=ea9f7e4cc6fd8c08d175ed7774ed2c5bd11c8ef0