Add *BSD support patch.

audio/libmp3splt/patches/patch-src_socket__manager.c

@@ -0,0 +1,16 @@
+$NetBSD: patch-src_socket__manager.c,v 1.1 2013/07/05 16:14:13 ryoon Exp $
+
+--- src/socket_manager.c.orig	2013-02-08 09:21:53.000000000 +0000
++++ src/socket_manager.c
+@@ -48,8 +48,10 @@ Manages a socket connection
+
+ #ifdef __WIN32__
+ #include <malloc.h>
++#elif defined(__NetBSD__) || defined(__FreeBSD__) || defined(__OpenBSD__) || defined(__DragonFly__)
++#include <stdlib.h>
+ #else
+-#include <alloca.h>
++include <alloca.h>
+ #endif
+
+ #include <string.h>