Update binutils release documentation to include using the -z option when invoking src-release.sh
diff --git a/binutils/README-how-to-make-a-release b/binutils/README-how-to-make-a-release
index 2318523..6c57137 100644
--- a/binutils/README-how-to-make-a-release
+++ b/binutils/README-how-to-make-a-release
@@ -306,11 +306,11 @@
 	   
       Then create the release tarballs:
   
-            ./src-release.sh -b -g -l -x binutils
+            ./src-release.sh -b -g -l -x -z binutils
 
       OR ... for a more reproducible tarball:
 
-            ./src-release.sh -b -g -l -x -r `git log -1 --format=%cd --date=format:%F bfd/version.m4` binutils
+            ./src-release.sh -b -g -l -x -z -r `git log -1 --format=%cd --date=format:%F bfd/version.m4` binutils
 
   24. Check that the files in the tarballs have the correct
       permissions.
@@ -600,7 +600,7 @@
 
        h. Create the release tarballs:
        
-            ./src-release -b -g -l -x binutils
+            ./src-release.sh -b -g -l -x -z binutils
 
        i. Check that the files in the tarballs have the correct
           permissions.