[kde-frameworks/kimageformats] Only apply rename workaround when the relevant USE flag is enabled.

Package-Manager: portage-2.2.7
[kde-frameworks/kimageformats] Remove workaround for collision that is now solved upstream.

Upstream commit 89a3e64c0eda9acefdd17782c5ade4d521615a9e.

Package-Manager: portage-2.2.7