fix(whl_library): correctly parse wheel target platforms #1811
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The #1693 PR incorrectly assumed that the platform tag will be os-arch
specific if and only if the abi tag is of form cpxy. However, there are
many wheels that are not like this (e.g. watchdog, tornado, libclang).
This fixes the starlark code that is overriding the user platforms with
something that only the wheel supports by also taking into account the
ABI.
Fixes #1810.