Fix const warning in the genheaders script as a result of
changes to the headers, as noted here:
http://linux.derkeiler.com/Mailing-Lists/Kernel/2010-03/msg03977.html
Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: James Morris <jmorris@namei.org>
        fprintf(fout, "\n");
 
        for (i = 1; i < isids_len; i++) {
-               char *s = initial_sid_to_string[i];
+               const char *s = initial_sid_to_string[i];
                fprintf(fout, "#define SECINITSID_%s", s);
                for (j = 0; j < max(1, 40 - strlen(s)); j++)
                        fprintf(fout, " ");