Fix GCC compilation

Author: Dmitry Kozlov

RadeonRays/src/accelerator/bvh2.cpp

@@ -227,8 +227,11 @@ namespace RadeonRays
 #else
         std::mutex mutex;
         std::condition_variable cv;
-        std::atomic_bool shutdown = false;
-        std::atomic_uint32_t num_refs_processed = 0;
+        std::atomic_bool shutdown;
+        std::atomic<std::uint32_t> num_refs_processed;
+
+		num_refs_processed.store(0);
+		shutdown.store(false);
 
         std::stack<SplitRequest> requests;
 

RadeonRays/src/accelerator/bvh2.h

@@ -25,11 +25,18 @@ THE SOFTWARE.
 #include <stack>
 #include <utility>
 #include <vector>
+#include <thread>
+#include <condition_variable>
 #include <mmintrin.h>
 #include <xmmintrin.h>
 #include <smmintrin.h>
 
 #include "../primitive/mesh.h"
+#include "../primitive/instance.h"
+
+#ifndef WIN32
+#define _MM_ALIGN16
+#endif
 
 namespace RadeonRays
 {