libstdc++/5816
	* include/bits/locale_facets.tcc
	(num_get::_M_extract_float): Fix the parsing of __dec, since
	the standard prescribes that if no grouping characters are
	seen, no grouping check is applied.
        * testsuite/22_locale/num_get_members_char.cc: Add test05
	distilled from the PR.
        * testsuite/22_locale/num_get_members_wchar_t.cc: Ditto.

From-SVN: r50317