Add llvm's libc++ stdc++ library, which supports c++11.

This is for 9.1-stable so ports can use it. libc++ isn't build by default in 9.x.
Borrow some code from the llvm/clang -devel ports for generating svn checkout
semi automaticly.

devel/Makefile

@@ -947,6 +947,7 @@
     SUBDIR += libbonobo-reference
     SUBDIR += libbonobomm
     SUBDIR += libburn
+    SUBDIR += libc++
     SUBDIR += libccid
     SUBDIR += libcfg
     SUBDIR += libcfu

devel/libc++/Makefile

+# Created by: Koop Mast <kwm@FreeBSD.org>
+# $FreeBSD$
+
+PORTNAME=	libc++
+PORTVERSION=	${SVN_REV}
+CATEGORIES=	devel
+MASTER_SITES=	LOCAL/kwm
+
+MAINTAINER=	kwm@FreeBSD.org
+COMMENT=	Llvm's C++ standard library with c++11 support
+
+BUILD_DEPENDS=	clang33:${PORTSDIR}/lang/clang33
+
+LICENSE_GROUP=	MIT UIUC
+LICENSE_NAME_UIUC=	University of Illinois/NCSA Open Source License
+LICENSE_PERMS_UIUC=	dist-mirror dist-sell pkg-mirror pkg-sell auto-accept
+
+USE_BZIP2=	yes
+USES=		cmake:outsource
+USE_LDCONFIG=	yes
+
+CC=	clang33
+CXX=	clang++33
+CPP=	clang-cpp33
+
+.include <bsd.port.options.mk>
+
+.if ${OSVERSION} <  901502
+IGNORE=		Doesn't build due to lack of aligned_alloc()
+.endif
+
+# This check can be replaced with a compiler groks c++11. Suggestions welcome.
+.if ${OSVERSION} >= 1000019 
+IGNORE=		libc++ is in base please use that
+.endif
+
+.if !defined(SVN_REV)
+.if defined(BOOTSTRAP)
+LANG=           "C"
+SVN_REV!=       svn info http://llvm.org/svn/llvm-project/ | ${GREP} Revision | cut -d' ' -f2
+.else
+.include "Makefile.svn_rev"
+.endif
+.endif
+
+.if defined(BOOTSTRAP) || defined(SVN_FETCH)
+FETCH_DEPENDS+= svn:${PORTSDIR}/devel/subversion
+
+do-fetch:
+	${MKDIR} ${WRKDIR}
+	svn export -r ${SVN_REV} \
+		http://llvm.org/svn/llvm-project/libcxx/trunk ${WRKSRC}
+	cd ${WRKDIR}; tar cvfy ${DISTDIR}/${DISTNAME}.tar.bz2 ${DISTNAME}
+	echo "SVN_REV=  ${SVN_REV}" > ${MASTERDIR}/Makefile.svn_rev
+.endif
+
+regression-test: build
+	cd ${WRKSRC}/test && ${SH} ./testit
+
+.include <bsd.port.mk>

devel/libc++/Makefile.svn_rev

+SVN_REV=  185324

devel/libc++/distinfo

+SHA256 (libc++-185324.tar.bz2) = fe074d4c969170075e906191b629d65c854962ec326b3d3c88c95fa384e64b8c
+SIZE (libc++-185324.tar.bz2) = 864599

devel/libc++/pkg-descr

+libc++ is a new implementation of the C++ standard library made by the 
+llvm project targeting C++11.
+
+WWW: http://libcxx.llvm.org/

devel/libc++/pkg-plist

+include/c++/v1/__bit_reference
+include/c++/v1/__config
+include/c++/v1/__debug
+include/c++/v1/__functional_03
+include/c++/v1/__functional_base
+include/c++/v1/__functional_base_03
+include/c++/v1/__hash_table
+include/c++/v1/__locale
+include/c++/v1/__mutex_base
+include/c++/v1/__split_buffer
+include/c++/v1/__sso_allocator
+include/c++/v1/__std_stream
+include/c++/v1/__tree
+include/c++/v1/__tuple
+include/c++/v1/__tuple_03
+include/c++/v1/__undef_min_max
+include/c++/v1/algorithm
+include/c++/v1/array
+include/c++/v1/atomic
+include/c++/v1/bitset
+include/c++/v1/cassert
+include/c++/v1/ccomplex
+include/c++/v1/cctype
+include/c++/v1/cerrno
+include/c++/v1/cfenv
+include/c++/v1/cfloat
+include/c++/v1/chrono
+include/c++/v1/cinttypes
+include/c++/v1/ciso646
+include/c++/v1/climits
+include/c++/v1/clocale
+include/c++/v1/cmath
+include/c++/v1/codecvt
+include/c++/v1/complex
+include/c++/v1/complex.h
+include/c++/v1/condition_variable
+include/c++/v1/csetjmp
+include/c++/v1/csignal
+include/c++/v1/cstdarg
+include/c++/v1/cstdbool
+include/c++/v1/cstddef
+include/c++/v1/cstdint
+include/c++/v1/cstdio
+include/c++/v1/cstdlib
+include/c++/v1/cstring
+include/c++/v1/ctgmath
+include/c++/v1/ctime
+include/c++/v1/cwchar
+include/c++/v1/cwctype
+include/c++/v1/deque
+include/c++/v1/exception
+include/c++/v1/ext/__hash
+include/c++/v1/ext/hash_map
+include/c++/v1/ext/hash_set
+include/c++/v1/forward_list
+include/c++/v1/fstream
+include/c++/v1/functional
+include/c++/v1/future
+include/c++/v1/initializer_list
+include/c++/v1/iomanip
+include/c++/v1/ios
+include/c++/v1/iosfwd
+include/c++/v1/iostream
+include/c++/v1/istream
+include/c++/v1/iterator
+include/c++/v1/limits
+include/c++/v1/list
+include/c++/v1/locale
+include/c++/v1/map
+include/c++/v1/memory
+include/c++/v1/mutex
+include/c++/v1/new
+include/c++/v1/numeric
+include/c++/v1/ostream
+include/c++/v1/queue
+include/c++/v1/random
+include/c++/v1/ratio
+include/c++/v1/regex
+include/c++/v1/scoped_allocator
+include/c++/v1/set
+include/c++/v1/sstream
+include/c++/v1/stack
+include/c++/v1/stdexcept
+include/c++/v1/streambuf
+include/c++/v1/string
+include/c++/v1/strstream
+include/c++/v1/support/solaris/floatingpoint.h
+include/c++/v1/support/solaris/wchar.h
+include/c++/v1/support/solaris/xlocale.h
+include/c++/v1/support/win32/limits_win32.h
+include/c++/v1/support/win32/locale_win32.h
+include/c++/v1/support/win32/math_win32.h
+include/c++/v1/support/win32/support.h
+include/c++/v1/system_error
+include/c++/v1/tgmath.h
+include/c++/v1/thread
+include/c++/v1/tuple
+include/c++/v1/type_traits
+include/c++/v1/typeindex
+include/c++/v1/typeinfo
+include/c++/v1/unordered_map
+include/c++/v1/unordered_set
+include/c++/v1/utility
+include/c++/v1/valarray
+include/c++/v1/vector
+lib/libc++.so
+lib/libc++.so.1
+lib/libc++.so.1.0
+@dirrmtry include/c++/v1/support/win32
+@dirrmtry include/c++/v1/support/solaris
+@dirrmtry include/c++/v1/support
+@dirrmtry include/c++/v1/ext
+@dirrmtry include/c++/v1
+@dirrmtry include/c++