PR libstdc++/67440
	* python/libstdcxx/v6/printers.py (find_type): Handle "const" in
	type name.
	* testsuite/libstdc++-prettyprinters/debug.cc: Add test for
	const set<int>.
	* testsuite/libstdc++-prettyprinters/simple.cc: Ditto.
	* testsuite/libstdc++-prettyprinters/simple11.cc: Ditto.

From-SVN: r230437