GHC should support static archive creation on all systems

Currently, we have in DriverPipeline.hs:

linkStaticLibCheck :: DynFlags -> [String] -> [UnitId] -> IO ()
linkStaticLibCheck dflags o_files dep_packages
 = do
    when (platformOS (targetPlatform dflags) `notElem` [OSiOS, OSDarwin]) $
      throwGhcExceptionIO (ProgramError "Static archive creation only supported on Darwin/OS X/iOS")
    linkBinary' True dflags o_files dep_packages

Seems a bit odd/awful for this to only work on OS X. Either we should support none of it (not GHC's job) or all of it.

Trac metadata

Trac field	Value
Version	7.11
Type	FeatureRequest
TypeOfFailure	OtherFailure
Priority	low
Resolution	Unresolved
Component	Compiler
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