HardenedBSD/contrib/libc++/FREEBSD-upgrade

$FreeBSD$

The FreeBSD copy of libc++.  This contains everything from the include and 
source directories upstream, with the exception of the support/win32 directory, 
which is only required for building on Windows (FreeBSD is not Windows).

To update, bring in anything new in source or include that is not
platform-dependent (unless the platform in question is FreeBSD, obviously).
Import libc++ / libcxxrt into base. Not build by default yet (use MK_LIBCPLUSPLUS=yes to enable). This is a work-in-progress. It works for me, but is not guaranteed to work for anyone else and may eat your dog. To build C++ using libc++, add -stdlib=libc++ to your CXX and LD flags. Bug reports welcome, bug fixes even more welcome... Approved by: dim (mentor) 2011-11-25 21:59:04 +01:00			$FreeBSD$

			`The FreeBSD copy of libc++. This contains everything from the include and`
			`source directories upstream, with the exception of the support/win32 directory,`
			`which is only required for building on Windows (FreeBSD is not Windows).`

			`To update, bring in anything new in source or include that is not`
			`platform-dependent (unless the platform in question is FreeBSD, obviously).`