Jack Nagel 46b80bd552 Revert "install: unlink old kegs"
This reverts commit 2eabe2cbc84649696aeb6fa842a70f3794955597.

When Keg#unlink looks for symlinks relative to the keg, it can hit false
positives that actually belong to a different keg and unlink them
anyway. This breaks our "force identical directory symlinks to be shared
real directory" case.

This may be a problem in general with the unlinking code and should be
investigated.

Signed-off-by: Jack Nagel <jacknagel@gmail.com>
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