Revert to manual quoting to make sure env variables can be used as part of other env variables when prefixing

[chvp]

Revert "Prefer escapeShellArg over manual quoting"

This reverts commit a773f912ea85cdfa04a13070431abfc0c19ce79f.

Fixes #258.

[zimbatm]

thanks!

bors merge

[bors[bot]]

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