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This solves deprecation warnings in build-script: ``` DeprecationWarning: 'pipes' is deprecated and slated for removal in Python 3.13 ``` This change assumes that the minimum version of Python3 is 3.3, which has `shlex.quote`. Since our build bots currently use 3.6 as their Python version, we can't yet use `shlex.join` to further simplify some of the code using quote.