Remove obsolete Extra-Resources logic.

This logic was used in pre-3.12 days when developers added compile time
extensions to ParaView. Removed  this obsolete logic which was causing build
errors in some cases.

Change-Id: Idc4d9c36951d6f0f8e46c6877f8d5b787fed70e7
Merge topic 'remove-extra-resources' into next

de66764a Remove obsolete Extra-Resources logic.