Fixed SDL build with mingw. In particular, replaced boost dependency by c++11.

JGE/Dependencies/SDL/src/main/windows/SDL_windows_main.c

@@ -150,7 +150,7 @@ console_main(int argc, char *argv[])
 
 /* This is where execution begins [windowed apps] */
 int WINAPI
-WinMain(HINSTANCE hInst, HINSTANCE hPrev, LPTSTR szCmdLine, int sw)
+WinMain(HINSTANCE hInst,HINSTANCE hPrev,LPSTR szCmdLine,int sw)
 {
     char **argv;
     int argc;

JGE/include/DebugRoutines.h

@@ -23,7 +23,7 @@ std::string ToHex(T* pointer)
     return stream.str();
 }
 
-#ifdef LINUX
+#if defined(LINUX) && !defined(OutputDebugString)
 #define OutputDebugString(val) (std::cerr << val);
 #endif
 

JGE/include/Threading.h

@@ -1,7 +1,7 @@
 #ifndef THREADING_H
 #define THREADING_H
 
-#if !defined(PSP) && !defined(QT_CONFIG) && !defined(WP8)
+#if !defined(PSP) && !defined(QT_CONFIG) && !defined(WP8) && !(defined(SDL_CONFIG) && defined(__MINGW32__))
 #include <boost/date_time.hpp>
 
 #ifdef WIN32
@@ -537,7 +537,7 @@ namespace boost
     }
 }
 
-#elif defined(WP8)
+#elif defined(WP8) || (defined(SDL_CONFIG) && defined(__MINGW32__))
 
 #include <thread>
 #include <mutex>

JGE/src/pc/JGfx.cpp

@@ -53,7 +53,7 @@ extern "C" {
 #include "../../include/JFileSystem.h"
 #include "../../include/JAssert.h"
 
-#if (defined WIN32) && (!defined QT_CONFIG)
+#if (defined WIN32) && (!defined QT_CONFIG) && (!defined __MINGW32__)
 #ifndef __attribute__
 #define __attribute__((a))
 #endif