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ENH: Implement feature request from issue 7885. Allow setting environment variables on a per-test basis for ctest using set_test_properties ENVIRONMENT.

When we install a target on Mac, we generate a call to install_name_tool to fix
install_name entries in the target for shared libraries it links.  This change
makes the step ignore entries for imported targets since their install_name
will not change and cmTarget cannot produce a mapping for them.  This fixes the
error

  GetLibraryNamesInternal called on imported target: kdelibs

seen by kde folks.

executing a ctest script so the search paths are fully set up and variables
like CMAKE_SYSTEM are available. This is useful e.g. for new-style ctest
scripting.
(these files are also loaded on startup by cpack, so now they behave
similar).
Hmmm, maybe they should be also loaded by cmake -P ?

Alex