RawFilePath conversion of System.Directory

By using System.Directory.OsPath, which takes and returns OsString,
which is a ShortByteString. So, things like dirContents currently have the
overhead of copying that to a ByteString, but that should be less than
the overhead of using Strings which often in turn were converted to
RawFilePaths.

Added Utility.OsString and the OsString build flag. That flag is turned
on in the stack.yaml, and will be turned on automatically by cabal when
built with new enough libraries. The stack.yaml change is a bit ugly,
and that could be reverted for now if it causes any problems.

Note that Utility.OsString.toOsString on windows is avoiding only a
check of encoding that is documented as being unlikely to fail. I don't
think it can fail in git-annex; if it could, git-annex didn't contain
such an encoding check before, so at worst that should be a wash.

Utility/OsString.hs

@@ -0,0 +1,38 @@
+{- OsString utilities
+ -
+ - Copyright 2025 Joey Hess <id@joeyh.name>
+ -
+ - License: BSD-2-clause
+ -}
+
+{-# LANGUAGE CPP #-}
+{-# LANGUAGE PackageImports #-}
+{-# OPTIONS_GHC -fno-warn-tabs #-}
+
+module Utility.OsString where
+
+#ifdef WITH_OSSTRING
+
+import Utility.RawFilePath
+
+import "os-string" System.OsString.Internal.Types
+import qualified Data.ByteString.Short as S
+
+{- Unlike System.OsString.fromBytes, on Windows this does not ensure a
+ - valid USC-2LE encoding. The input ByteString must be in a valid encoding
+ - already or uses of the OsString will fail. -}
+toOsString :: RawFilePath -> OsString
+#if defined(mingw32_HOST_OS)
+toOsString = OsString . WindowsString . S.toShort
+#else
+toOsString = OsString . PosixString . S.toShort
+#endif
+
+fromOsString :: OsString -> RawFilePath
+#if defined(mingw32_HOST_OS)
+fromOsString = S.fromShort . getWindowsString . getOsString
+#else
+fromOsString = S.fromShort . getPosixString . getOsString
+#endif
+
+#endif /* WITH_OSSTRING */