Link libstdc++ to unbreak build of the ports that depend on boehm-gc.

Reported by:	jmallett and kris

devel/boehm-gc/Makefile

@@ -7,7 +7,7 @@
 
 PORTNAME=	boehm-gc
 PORTVERSION=	6.2.a4
-PORTREVISION=	1
+PORTREVISION=	2
 CATEGORIES=	devel
 MASTER_SITES=	http://www.hpl.hp.com/personal/Hans_Boehm/gc/gc_source/
 DISTNAME=	gc${PORTVERSION:S/.a/alpha/}

devel/boehm-gc/files/patch-configure

@@ -1,6 +1,15 @@
---- configure	2002/12/17 10:14:24	1.1
-+++ configure	2002/12/17 10:14:32
-@@ -7645,6 +7645,7 @@
+--- configure.orig	Sat Mar  8 09:29:30 2003
++++ configure	Mon May  5 21:48:08 2003
+@@ -3780,7 +3780,7 @@
+ esac
+ 
+ if test "${enable_cplusplus}" = yes; then
+-      addobjs="$addobjs gc_cpp.lo"
++      addobjs="$addobjs gc_cpp.lo -lstdc++"
+       addincludes="$addincludes include/gc_cpp.h include/gc_allocator.h"
+       addtests="$addtests test_cpp"
+ fi
+@@ -8479,6 +8479,7 @@
  
  # This can be used to rebuild libtool when needed
  LIBTOOL_DEPS="$ac_aux_dir/ltmain.sh"