Fix compilation with MinGW

src/Nazara/Core/Win32/ThreadImpl.cpp

@@ -63,6 +63,7 @@ namespace Nz
 
 	void ThreadImpl::SetThreadName(DWORD threadId, const char* threadName)
 	{
+		#ifdef NAZARA_COMPILER_MSVC
 		// https://msdn.microsoft.com/en-us/library/xcb2z8hs.aspx
 		constexpr DWORD MS_VC_EXCEPTION = 0x406D1388;
 
@@ -82,6 +83,9 @@ namespace Nz
 		{
 		}
 		#pragma warning(pop)
+		#else
+		NazaraWarning("SetThreadName on Windows is only supported with MSVC for now");
+		#endif
 	}
 
 	unsigned int __stdcall ThreadImpl::ThreadProc(void* userdata)