Revert "Make kdevelop buildable without kdevelop-pg-qt"

Authored by kfunk on Tue, Sep 12, 10:01 PM.

Description

Revert "Make kdevelop buildable without kdevelop-pg-qt"

Sorry, it works without this patch. Seems like I didn't clean the build
dir properly.

This reverts commit f3d0d879dc856aee3f005c6fb051a2553100b3f5.