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

debian/changelog

@@ -10,7 +10,7 @@ git-annex (5.20150406) unstable; urgency=medium
     guid has been downloaded before, even when the url has changed.
   * importfeed: Always store itemid in metadata; before this was only
     done when annex.genmetadata was set.
-  * Relax debian package dependencies to git >= 1:1.7.7.6 rather
+  * Relax debian package dependencies to git >= 1:1.8.1 rather
     than needing >= 1:2.0.
   * test: Fix --list-tests
   * addurl --file: When used with a special remote that claims

debian/control

@@ -75,7 +75,7 @@ Build-Depends:
 	lsof [!kfreebsd-i386 !kfreebsd-amd64 !hurd-any],
 	ikiwiki,
 	perlmagick,
-	git (>= 1:1.7.7.6),
+	git (>= 1:1.8.1),
 	rsync,
 	wget,
 	curl,
@@ -92,7 +92,7 @@ Package: git-annex
 Architecture: any
 Section: utils
 Depends: ${misc:Depends}, ${shlibs:Depends},
-	git (>= 1:1.7.7.6),
+	git (>= 1:1.8.1),
 	rsync,
 	wget,
 	curl,