Add min_$TARGET_API_version cfg predicates#3036

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rylev wants to merge 3 commits intorust-lang:masterfrom rylev:min-target-api-version

+205

Commits on Dec 15, 2020

Add min_target_api_version RFC
rylev
committed

Commits on Dec 18, 2020

Fix broken link
rylev
committed

Commits on Feb 1, 2021

Change to platform specific predicates
rylev
committed