[hdrck] use diff -B -b

tools/hdrck/hdrck.ml

@@ -422,7 +422,7 @@ let check_spec_discrepancies
     (specs: (string, string) Hashtbl.t)
     (headers: (string, string) Hashtbl.t) : unit =
   let eq_header orig_file template_hdr =
-    let cmd = Format.sprintf "headache -c %s -e %s | diff -B -q - %s > /dev/null"
+    let cmd = Format.sprintf "headache -c %s -e %s | diff -b -B -q - %s > /dev/null"
         config_file_opts orig_file template_hdr
     in
     let ret = Sys.command cmd in