Similar to bug 212465, lang/gcc5 doesn't compile with recent versions of

libc++, because it attempts to redefine abort():

In file included from /wrkdirs/usr/ports/lang/gcc5/work/gcc-5.4.0/gcc/auto-profile.c:25:
In file included from /usr/include/c++/v1/map:446:
/usr/include/c++/v1/functional:1398:2: error: no member named 'fancy_abort' in namespace 'std::__1'; did you mean simply 'fancy_abort'?
        _VSTD::abort();
        ^~~~~~~
/usr/include/c++/v1/__config:383:15: note: expanded from macro '_VSTD'
#define _VSTD std::_LIBCPP_NAMESPACE
              ^

Patch this in the same way as the other gcc ports, by including <new> in
gcc/system.h, and moving a few includes to before "system.h".

Approved by:	gerald (maintainer)
PR:		216266
MFH:		2017Q1

lang/gcc5/files/patch-libc++

@@ -0,0 +1,43 @@
+--- gcc/auto-profile.c.orig	2015-01-18 02:25:42 UTC
++++ gcc/auto-profile.c
+@@ -19,11 +19,9 @@ along with GCC; see the file COPYING3.  
+ <http://www.gnu.org/licenses/>.  */
+ 
+ #include "config.h"
+-#include "system.h"
+-
+-#include <string.h>
+ #include <map>
+ #include <set>
++#include "system.h"
+ 
+ #include "coretypes.h"
+ #include "hash-set.h"
+--- gcc/graphite-isl-ast-to-gimple.c.orig	2017-01-19 21:02:12 UTC
++++ gcc/graphite-isl-ast-to-gimple.c
+@@ -38,6 +38,7 @@ extern "C" {
+ #endif
+ #endif
+ 
++#include <map>
+ #include "system.h"
+ #include "coretypes.h"
+ #include "hash-set.h"
+@@ -75,7 +76,6 @@ extern "C" {
+ #include "tree-scalar-evolution.h"
+ #include "gimple-ssa.h"
+ #include "tree-into-ssa.h"
+-#include <map>
+ 
+ #ifdef HAVE_isl
+ #include "graphite-poly.h"
+--- gcc/system.h.orig	2015-01-05 12:33:28 UTC
++++ gcc/system.h
+@@ -217,6 +217,7 @@ extern int errno;
+ #ifdef __cplusplus
+ # include <algorithm>
+ # include <cstring>
++# include <new>
+ # include <utility>
+ #endif
+