Auto-find Clazy documentation also with clazy >= 1.4

Summary:
BUG: 401075
FIXED-IN: 5.3.1

Test Plan:
Remove entries from kdeveloprc, paths are auto.detected both with
clazy 1.4 and clazy 1.3 (well, its simulated doc path).

Reviewers: #kdevelop, kfunk

Reviewed By: #kdevelop, kfunk

Subscribers: kfunk, kdevelop-devel

Tags: #kdevelop

Differential Revision: https://phabricator.kde.org/D16910