Work around incompatible sort and find on windows.

If the PATH lists the Windows system directories before the MSYS
directories, Windows's own incompatible sort and find commands would be
picked up. We implement these commands as functions and call the real
tools by absolute path.

Also add a dummy implementation of sync to avoid an error in git-repack.

Signed-off-by: Johannes Sixt <johannes.sixt@telecom.at>

git-sh-setup.sh

@@ -129,3 +129,20 @@ test -n "$GIT_DIR" && GIT_DIR=$(cd "$GIT_DIR" && pwd) || {
 }
 
 : ${GIT_OBJECT_DIRECTORY="$GIT_DIR/objects"}
+
+# Fix some commands on Windows
+case $(uname -s) in
+*MINGW*)
+	# Windows has its own (incompatible) sort and find
+	sort () {
+		/usr/bin/sort "$@"
+	}
+	find () {
+		/usr/bin/find "$@"
+	}
+	# sync is missing
+	sync () {
+		:	# no implementation
+	}
+	;;
+esac