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SystemTools: Enable empty environment variable for WIN32

Johan Öbergrequested to merge
devjoa/kwsys:fix-windows-empty-environment-variable-inconcistency into master

This commit changes the env command mode to accept empty environment variables when CMake is running in WIN32 environment. Previously was the variable deleted, thus giving inconsistency in the behaviour between Window and UNIX, as UNIX allowed empty environment variables.

To delete a environment variable, the Windows user must use the --unset= argument.

BREAKING CHANGE: environment variables is not deleted when assigned empty on WIN32

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