The array is defined as having NUM_LOCALEDIR entries, so use that
instead of hardcoded 256 value (the other two calls already did this).

Reported by parfait:
   Buffer overflow (CWE 120): In pointer dereference of argv[argc] with index argc
      Pointer size is 64 elements (of 8 bytes each), index is 255
        at line 82 of nx-X11/lib/X11/lcFile.c in function 'parse_line'.
        called at line 178 in function '_XlcParsePath' with argv = argv.
        called at line 722 in function '_XlcLocaleLibDirName' with argv = args, argsize = 256.
        at line 82 of nx-X11/lib/X11/lcFile.c in function 'parse_line'.
        called at line 178 in function '_XlcParsePath' with argv = argv.
        called at line 638 in function '_XlcLocaleDirName' with argv = args, argsize = 256.

[ This bug was found by the Parfait 1.2.0 bug checking tool.
  http://labs.oracle.com/pls/apex/f?p=labs:49:::::P49_PROJECT_ID:13 ]
Signed-off-by: Alan Coopersmith <alan.coopersmith@oracle.com>
Backported-to-NX-by: Ulrich Sibiller <uli42@gmx.de>