write pip delete marker into global build dir upon creation #948
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a "partial" fix for #939.
this change writes the pip delete marker into the global build dir upon creation, so it can be removed during the cleanup step.
this change is not helpful if the user already has the global build dir, which will be most pre-existing users. so, this fix is not so exciting.
#906 (in milestone 1.5), intends to handle this better by moving to mkdtemp build dirs in all cases.