Use autocfg instead of unstable feature(cfg_target_has_atomic)#2294

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taiki-e wants to merge 3 commits intorust-lang:masterfrom taiki-e:cfg_target_has_atomic

+230-97

Commits on Jan 1, 2021

Use autocfg instead of unstable feature(cfg_target_has_atomic)
taiki-e
committed
Change has_atomic_cas to no_atomic_cas to implement a workaround for the first problem
taiki-e
committed
Remove build script from futures crate
taiki-e
committed