regex_compiler.h: Nest namespace versioning.

regex_compiler.h: Nest namespace versioning.

2011-03-14  Benjamin Kosnik  <bkoz@redhat.com>

	* include/bits/regex_compiler.h: Nest namespace versioning.
	* include/bits/regex_grep_matcher.tcc: Same.
	* include/bits/regex_grep_matcher.h: Same.
	* include/bits/regex_cursor.h: Same.
	* include/bits/regex_nfa.h: Same.
	* include/bits/regex_nfa.tcc: Same.

	* include/bits/regex_grep_matcher.h: Version forward declarations.
	* include/bits/c++config: Add namespace association for __regex.
	* include/bits/regex.h: Make sub_match consistent.

From-SVN: r170978