Fix build of Box2D with gcc4.3.

Still applies against current Box2D upstream.

Lubomir Rintel <lkundrak@v3.sk>

diff -urp numptyphysics/Box2D/Source/Collision/b2BroadPhase.cpp numptyphysics/Box2D/Source/Collision/b2BroadPhase.cpp

--- numptyphysics.orig/Box2D/Source/Collision/b2BroadPhase.cpp	2008-09-25 14:40:28.000000000 +0200

+++ numptyphysics/Box2D/Source/Collision/b2BroadPhase.cpp	2008-09-25 16:16:39.000000000 +0200

@@ -18,6 +18,7 @@

 #include "b2BroadPhase.h"

 #include <algorithm>

+#include <cstring>

 // Notes:

 // - we use bound arrays instead of linked lists for cache coherence.

diff -urp numptyphysics/Box2D/Source/Common/b2BlockAllocator.cpp numptyphysics/Box2D/Source/Common/b2BlockAllocator.cpp

--- numptyphysics.orig/Box2D/Source/Common/b2BlockAllocator.cpp	2008-09-25 14:40:28.000000000 +0200

+++ numptyphysics/Box2D/Source/Common/b2BlockAllocator.cpp	2008-09-25 16:17:46.000000000 +0200

@@ -20,6 +20,7 @@

 #include <cstdlib>

 #include <memory>

 #include <climits>

+#include <cstring>

 int32 b2BlockAllocator::s_blockSizes[b2_blockSizes] = 

 {

diff -urp numptyphysics/Box2D/Source/Dynamics/Contacts/b2CircleContact.cpp numptyphysics/Box2D/Source/Dynamics/Contacts/b2CircleContact.cpp

--- numptyphysics.orig/Box2D/Source/Dynamics/Contacts/b2CircleContact.cpp	2008-09-25 14:40:28.000000000 +0200

+++ numptyphysics/Box2D/Source/Dynamics/Contacts/b2CircleContact.cpp	2008-09-25 16:17:57.000000000 +0200

@@ -22,6 +22,7 @@

 #include "../../Common/b2BlockAllocator.h"

 #include <new>

+#include <cstring>

 b2Contact* b2CircleContact::Create(b2Shape* shape1, b2Shape* shape2, b2BlockAllocator* allocator)

 {

diff -urp numptyphysics/Box2D/Source/Dynamics/Contacts/b2PolyAndCircleContact.cpp numptyphysics/Box2D/Source/Dynamics/Contacts/b2PolyAndCircleContact.cpp

--- numptyphysics.orig/Box2D/Source/Dynamics/Contacts/b2PolyAndCircleContact.cpp	2008-09-25 14:40:28.000000000 +0200

+++ numptyphysics/Box2D/Source/Dynamics/Contacts/b2PolyAndCircleContact.cpp	2008-09-25 16:17:48.000000000 +0200

@@ -22,6 +22,7 @@

 #include "../../Common/b2BlockAllocator.h"

 #include <new>

+#include <cstring>

 b2Contact* b2PolyAndCircleContact::Create(b2Shape* shape1, b2Shape* shape2, b2BlockAllocator* allocator)

 {

diff -urp numptyphysics/Box2D/Source/Dynamics/Contacts/b2PolyContact.cpp numptyphysics/Box2D/Source/Dynamics/Contacts/b2PolyContact.cpp

--- numptyphysics.orig/Box2D/Source/Dynamics/Contacts/b2PolyContact.cpp	2008-09-25 14:40:28.000000000 +0200

+++ numptyphysics/Box2D/Source/Dynamics/Contacts/b2PolyContact.cpp	2008-09-25 16:17:49.000000000 +0200

@@ -23,6 +23,7 @@

 #include <memory>

 #include <new>

+#include <cstring>

 b2Contact* b2PolygonContact::Create(b2Shape* shape1, b2Shape* shape2, b2BlockAllocator* allocator)

 {