Allow build-std to take an array of crate names
#1488
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Emilgardis
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Closes #896.
This is technically a breaking change because arbitrary strings passed to the
CROSS_BUILD_STDenvironment variable (e.g.yes) are now no longer parsed as truthy values, but rather as a single crate name (or multiple, if containing commas) to pass to-Zbuild-std(resulting in e.g.-Zbuild-std=yes, which is invalid).Behaviour remains the same when
CROSS_BUILD_STDis set totrue,false, or a number that fits in ani32.