fts.c compilation error

[Bruno Haible]

A gnulib testdir with modules fts and quotearg fails to compile on IRIX 6.5
with CC="cc -O":

        cc -O -DHAVE_CONFIG_H -I. -I. -I..      -g -c fts.c

"fts.c", line 244: error(1241): declaration may not appear after executable
          statement in block
        size_t maxarglen = fts_maxarglen(argv);
        ^

1 error detected in the compilation of "fts.c".

Bruno