Ludovic Courtès ff23b47dbe
tests: 'guix-gc.sh' passes even when 'out' or 'drv' are defined as env vars.
This fixes a test failure exhibited by
fb17a89912c2a3738dae716e30481c11e1c6f0ac whereby assignments to 'out' in
guix-gc.sh would go to the 'out' environment variable, when it exists,
which in turn prevents garbage collection of $out.

* tests/guix-gc.sh: Add 'unset' invocations.
2017-11-13 10:10:13 +01:00
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