Fixes for compatibility with FreeBSD

backtrace.cpp assumes that anything non-windows is linux.

stb_vorbis.c includes malloc.h which has been deprecated since the 90s
on all implementations other than MSVC.

The stat64 hack in file_util.cpp is only needed on linux.

http_client.h also assumes non-windows is linux.

base/backtrace.cpp

@@ -1,6 +1,6 @@
 #include "base/backtrace.h"
 
-#ifndef _MSC_VER
+#ifdef __linux__
 
 // LINUX ONLY
 

ext/stb_vorbis/stb_vorbis.c

@@ -205,7 +205,7 @@
 #include <string.h>
 #include <assert.h>
 #include <math.h>
-#if !(defined(__APPLE__) || defined(MACOSX) || defined(macintosh) || defined(Macintosh))
+#ifdef _MSC_VER
 #include <malloc.h>
 #endif
 #else

file/file_util.cpp

@@ -17,6 +17,10 @@
 #include "base/basictypes.h"
 #include "file/file_util.h"
 
+#ifdef __FreeBSD__
+#define stat64 stat
+#endif
+
 bool writeStringToFile(bool text_file, const std::string &str, const char *filename)
 {
 	FILE *f = fopen(filename, text_file ? "w" : "wb");

net/http_client.h

@@ -4,11 +4,15 @@
 #include "base/basictypes.h"
 #include "base/buffer.h"
 
-#ifndef _WIN32
-#include <arpa/inet.h>
-#include <sys/socket.h>
-#else
+#ifdef _WIN32
 #include <winsock2.h>
+#else
+#ifdef __FreeBSD__
+#include <netinet/in.h>
+#else
+#include <arpa/inet.h>
+#endif
+#include <sys/socket.h>
 #endif
 
 namespace net {