Remove redundant "do", "return" and language extensions from base

libraries/base/.hlint.yaml

libraries/base/Control/Concurrent/Chan.hs

libraries/base/Control/Concurrent/QSem.hs

libraries/base/Control/Concurrent/QSemN.hs

libraries/base/Control/Monad/ST/Lazy/Imp.hs

libraries/base/Data/String.hs

libraries/base/Debug/Trace.hs

libraries/base/Foreign/Marshal/Array.hs

libraries/base/Foreign/Marshal/Utils.hs

libraries/base/GHC/Conc/POSIX.hs

libraries/base/GHC/Environment.hs

libraries/base/GHC/Event/Array.hs

libraries/base/GHC/Event/Control.hs

libraries/base/GHC/Event/Manager.hs

libraries/base/GHC/Event/Thread.hs

libraries/base/GHC/Event/TimerManager.hs

libraries/base/GHC/Fingerprint.hs

libraries/base/GHC/IO/Buffer.hs

libraries/base/GHC/IO/Encoding/Failure.hs

libraries/base/GHC/IO/Encoding/Iconv.hs