boost_concept_check.h (struct _SequenceConcept): Remove wrong requirement, i.e., not present in Table 67.

2004-09-23  Paolo Carlini  <pcarlini@suse.de>
	    Magnus Fromreide  <magfr@lysator.liu.se>

	* include/bits/boost_concept_check.h (struct _SequenceConcept):
	Remove wrong requirement, i.e., not present in Table 67.

Co-Authored-By: Magnus Fromreide <magfr@lysator.liu.se>

From-SVN: r87937