Add missing dependency on kdepim.
Try to fix Undefined symbol "pthread_attr_init" symbol:
Although TaskJugglerUI is linked with -pthread, the resulting binary
is not linked agains libpthread. (huh? gcc trying to be too smart?)
Adding a dummy pthread_ call fixes this.
PR: 98205, 98517
Reported by: Ken Gunderson <firstname.lastname@example.org>
Daniel Graupner <Daniel@smartcast.org>