Updated the CMCSTL2 package find module to no longer set CMCSTL2_INCLUDE_DIRS as a cache variable.
Updated the CMCSTL2 package find module to no longer set CMCSTL2_INCLUDE_DIRS as a cache variable.

The cmake-developer documentation states that package find modules should not
set the <package>_INCLUDE_DIRS variable as a cache variable.  This change
results in a normal variable getting set instead of a cache variable.

tahonermann/text_view-range-v3,tahonermann/text_view,tahonermann/text_view,tahonermann/text_view-range-v3