winio: Multiple refactorings and support changes.

includes/rts/FileLock.h

includes/rts/IOManager.h

libraries/base/Control/Concurrent.hs-boot

libraries/base/GHC/Conc.hs

libraries/base/GHC/Conc/IO.hs

libraries/base/GHC/Conc/Sync.hs

libraries/base/GHC/Conc/Sync.hs-boot

libraries/base/GHC/Conc/Windows.hs

libraries/base/GHC/ConsoleHandler.hsc

libraries/base/GHC/Event/Internal.hs

libraries/base/GHC/Event/Thread.hs

libraries/base/GHC/Event/TimerManager.hs

libraries/base/GHC/IO/FD.hs

libraries/base/GHC/IO/Handle/Lock/Windows.hsc

libraries/base/System/Timeout.hs

libraries/base/base.cabal

libraries/base/cbits/Win32Utils.c

libraries/base/cbits/consUtils.c

libraries/base/include/consUtils.h

rts/FileLock.c