Use stdin reflist passing in git-fetch.sh

Use the new stdin reflist passing mechanism for the call to
fetch--tool parse-reflist, allowing passing of more than ~128K
of reflist data.

Signed-off-by: Julian Phillips <julian@quantumfyre.co.uk>
Signed-off-by: Junio C Hamano <junkio@cox.net>

git-fetch.sh

@@ -156,7 +156,7 @@ fi
 
 fetch_native () {
 
-  eval=$(git-fetch--tool parse-reflist "$1")
+  eval=$(echo "$1" | git-fetch--tool parse-reflist "-")
   eval "$eval"
 
     ( : subshell because we muck with IFS