CMake Nightly Date Stamp
Tests: Teach CMakeOnly.AllFindModules to tolerate a system KDE4

The FindKDE4 module (incorrectly) modifies CMAKE_MODULE_PATH on the
caller's behalf.  This causes KDE4-installed find modules to be used by
the test instead of those in CMake.  Teach the test to restore the
CMAKE_MODULE_PATH to its original value after each find_package call.
This ensures that the next find_package actually tests our module.
Merge topic 'fix-AllFindModules-test-module-path' into next

cf3e87e1 Tests: Teach CMakeOnly.AllFindModules to tolerate a system KDE4
8b8691ad CMake Nightly Date Stamp