use std::function in Thread_Create so we can revert back to using it

src/GPU3D_Soft.cpp

@@ -37,10 +37,8 @@ void SoftRenderer::StopRenderThread()
     {
         RenderThreadRunning = false;
         Platform::Semaphore_Post(Sema_RenderStart);
-        // Platform::Thread_Wait(RenderThread);
-        // Platform::Thread_Free(RenderThread);
-        RenderThread.join();
-        
+        Platform::Thread_Wait(RenderThread);
+        Platform::Thread_Free(RenderThread);
     }
 }
 
@@ -51,8 +49,7 @@ void SoftRenderer::SetupRenderThread()
         if (!RenderThreadRunning)
         {
             RenderThreadRunning = true;
-            //RenderThread = Platform::Thread_Create(RenderThreadFunc);
-            RenderThread = std::thread(&SoftRenderer::RenderThreadFunc, this);
+            RenderThread = Platform::Thread_Create(std::bind(&RenderThreadFunc, this));
         }
 
         // otherwise more than one frame can be queued up at once

src/GPU3D_Soft.h

@@ -505,8 +505,7 @@ private:
     // threading
 
     bool Threaded;
-    // Platform::Thread* RenderThread;
-    std::thread RenderThread;
+    Platform::Thread* RenderThread;
     bool RenderThreadRunning;
     bool RenderThreadRendering;
     Platform::Semaphore* Sema_RenderStart;

src/Platform.h

@@ -21,6 +21,8 @@
 
 #include "types.h"
 
+#include <functional>
+
 namespace Platform
 {
 
@@ -68,7 +70,7 @@ inline bool LocalFileExists(const char* name)
 }
 
 struct Thread;
-Thread* Thread_Create(void (*func)());
+Thread* Thread_Create(std::function<void()> func);
 void Thread_Free(Thread* thread);
 void Thread_Wait(Thread* thread);
 

src/frontend/qt_sdl/Platform.cpp

@@ -188,7 +188,7 @@ FILE* OpenLocalFile(const char* path, const char* mode)
     return OpenFile(fullpath.toUtf8(), mode, mode[0] != 'w');
 }
 
-Thread* Thread_Create(void (* func)())
+Thread* Thread_Create(std::function<void()> func)
 {
     QThread* t = QThread::create(func);
     t->start();