Fix posix/bug-regex5.c test case, adapt to iso14651_t1_common upate

This test case tests how many collating elements are defined in
da_DK.ISO-8859-1 locale. The da_DK locale source defines 4:

collating-element <A-A> from "<U0041><U0041>"
collating-element <A-a> from "<U0041><U0061>"
collating-element <a-A> from "<U0061><U0041>"
collating-element <a-a> from "<U0061><U0061>"

The new iso14651_t1_common file defines more collating elements, two
of them are in the ISO-8859-1 range:

collating-element <U004C_00B7> from "<U004C><U00B7>" % decomposition of LATIN CAPITAL LETTER L WITH MIDDLE DOT
collating-element <U006C_00B7> from "<U006C><U00B7>" % decomposition of LATIN SMALL LETTER L WITH MIDDLE DOT

So the total count is now 6 instead of 4.

	* posix/bug-regex5.c: Fix test case because with the new
        iso14651_t1_common file, the da_DK locale now has 6 collating elements
        in the ISO-8859-1 range instead of 4 with the old iso14651_t1_common
        file.