libgo: Update to October 24 version of master library.

From-SVN: r204466
diff --git a/libgo/configure.ac b/libgo/configure.ac
index f7b780b..1e84dc7 100644
--- a/libgo/configure.ac
+++ b/libgo/configure.ac
@@ -133,6 +133,7 @@
 is_linux=no
 is_netbsd=no
 is_openbsd=no
+is_dragonfly=no
 is_rtems=no
 is_solaris=no
 GOOS=unknown
@@ -143,6 +144,7 @@
   *-*-linux*)    is_linux=yes;   GOOS=linux ;;
   *-*-netbsd*)	 is_netbsd=yes;  GOOS=netbsd ;;
   *-*-openbsd*)  is_openbsd=yes; GOOS=openbsd ;;
+  *-*-dragonfly*) is_dragonfly=yes; GOOS=dragonfly ;;
   *-*-rtems*)    is_rtems=yes;   GOOS=rtems ;;
   *-*-solaris2*) is_solaris=yes; GOOS=solaris ;;
 esac
@@ -152,6 +154,7 @@
 AM_CONDITIONAL(LIBGO_IS_LINUX, test $is_linux = yes)
 AM_CONDITIONAL(LIBGO_IS_NETBSD, test $is_netbsd = yes)
 AM_CONDITIONAL(LIBGO_IS_OPENBSD, test $is_openbsd = yes)
+AM_CONDITIONAL(LIBGO_IS_DRAGONFLY, test $is_dragonly = yes)
 AM_CONDITIONAL(LIBGO_IS_RTEMS, test $is_rtems = yes)
 AM_CONDITIONAL(LIBGO_IS_SOLARIS, test $is_solaris = yes)
 AC_SUBST(GOOS)
@@ -471,7 +474,7 @@
   ;;
 esac
 
-AC_CHECK_HEADERS(sys/file.h sys/mman.h syscall.h sys/epoll.h sys/inotify.h sys/ptrace.h sys/syscall.h sys/user.h sys/utsname.h sys/select.h sys/socket.h net/if.h net/if_arp.h net/route.h netpacket/packet.h sys/prctl.h sys/mount.h sys/vfs.h sys/statfs.h sys/timex.h sys/sysinfo.h utime.h linux/ether.h linux/fs.h linux/reboot.h netinet/in_syst.h netinet/ip.h netinet/ip_mroute.h netinet/if_ether.h)
+AC_CHECK_HEADERS(sys/file.h sys/mman.h syscall.h sys/epoll.h sys/inotify.h sys/ptrace.h sys/syscall.h sys/user.h sys/utsname.h sys/select.h sys/socket.h net/if.h net/if_arp.h net/route.h netpacket/packet.h sys/prctl.h sys/mount.h sys/vfs.h sys/statfs.h sys/timex.h sys/sysinfo.h utime.h linux/ether.h linux/fs.h linux/reboot.h netinet/icmp6.h netinet/in_syst.h netinet/ip.h netinet/ip_mroute.h netinet/if_ether.h)
 
 AC_CHECK_HEADERS([linux/filter.h linux/if_addr.h linux/if_ether.h linux/if_tun.h linux/netlink.h linux/rtnetlink.h], [], [],
 [#ifdef HAVE_SYS_SOCKET_H