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e301cbffcc
Add the ability to modify the environment of the various steps running as part of an external project build. This specifically adds the ability to set them on the configure , build , install, and test steps, as well as exposing the `ENVIRONMENT_MODIFICATION` keyword arguments to `ExternalProject_Add_Step`, allowing customization of the environment of custom steps. The values of the environment variable respect the `LIST_SEPARATOR`. Fixes: #26963