Allow over-writing existing targets #339
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Description
Depending on the conda environment, the same file may be written to multiple times (eg. if a specific lib.so file exists, multiple conda packages may have it and at pack time conda-pack will pull from the cache'd original copy of the package and copy it in; when multiple packages have the same lib.so file they'll over-write each other).
shutil.copy2 doesn't handle overwriting existing symlinks cleanly: it overwrites files silently but fails on creating a symlink (probably worth a separate PR to cpython later). Allow for this by explicitly deleting existing targets.
Checklist - did you ...
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directory (using the template) for the next release's release notes?