binutils: properly split ar and ranlib

By not linking the exact same object file twice, in particular ranlib can
benefit quite a bit from the compiler eliminating dead code.

binutils/ar.c

@@ -67,7 +67,9 @@ static int mri_mode;
 /* This flag distinguishes between ar and ranlib:
    1 means this is 'ranlib'; 0 means this is 'ar'.
    -1 means if we should use argv[0] to decide.  */
+#ifndef is_ranlib
 extern int is_ranlib;
+#endif
 
 /* Nonzero means don't warn about creating the archive file if necessary.  */
 int silent_create = 0;
@@ -735,6 +737,7 @@ main (int argc, char **argv)
 
   expandargv (&argc, &argv);
 
+#ifndef is_ranlib
   if (is_ranlib < 0)
     {
       const char *temp = lbasename (program_name);
@@ -745,6 +748,7 @@ main (int argc, char **argv)
       else
 	is_ranlib = 0;
     }
+#endif
 
   if (bfd_init () != BFD_INIT_MAGIC)
     fatal (_("fatal error: libbfd ABI mismatch"));