avoid using --literal-pathspecs with git older than 1.8.1 which added it

Windows is still building with an older git.

Annex/Fixup.hs

@@ -11,6 +11,7 @@ import Git.Types
 import Git.Config
 import Types.GitConfig
 import qualified Git.Construct as Construct
+import qualified Git.BuildVersion
 import Utility.Path
 import Utility.SafeCommand
 import Utility.Directory
@@ -36,8 +37,10 @@ fixupRepo r c = do
 {- Disable git's built-in wildcard expansion, which is not wanted
  - when using it as plumbing by git-annex. -}
 disableWildcardExpansion :: Repo -> Repo
-disableWildcardExpansion r = r 
-	{ gitGlobalOpts = gitGlobalOpts r ++ [Param "--literal-pathspecs"] }
+disableWildcardExpansion r
+	| Git.BuildVersion.older "1.8.1" = r
+	| otherwise = r
+		{ gitGlobalOpts = gitGlobalOpts r ++ [Param "--literal-pathspecs"] }
 
 {- Direct mode repos have core.bare=true, but are not really bare.
  - Fix up the Repo to be a non-bare repo, and arrange for git commands