Fix space leak in ./Setup configure #3076
Merged
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This commit fixes the space leak in #2777 without modifying the logic for choosing flags. It is a lot simpler than #2925, though I think an improvement to the algorithm like in #2925 is still needed. I tested the practicality of solving for more flags by running
./Setup configure
on git-annex with 3 of the 21 flags removed. Most of the dependencies were missing, which meant that Setup had to try all 2^18 flag combinations. It took 13 minutes./cc @joeyh