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Remove C++11 from GLFW3 platform backend

--- a/src/Backends/Platform/GLFW3.cpp

+++ b/src/Backends/Platform/GLFW3.cpp

@@ -1,6 +1,5 @@

 #include "../Misc.h"

-#include <chrono>

 #include <stdarg.h>

 #include <stddef.h>

 #include <stdio.h>

@@ -7,8 +6,16 @@

 #include <stdlib.h>

 #include <string.h>

 #include <string>

-#include <thread>

+#if __cplusplus >= 201103L

+	#include <chrono>

+	#include <thread>

+#elif defined(_WIN32)

+	#include "windows.h"

+#else

+	#include <unistd.h>

+#endif

+

 #include <GLFW/glfw3.h>

 #include "../Rendering.h"

@@ -319,6 +326,12 @@

 void Backend_Delay(unsigned int ticks)

 {

+#if __cplusplus >= 201103L

 	// GLFW3 doesn't have a delay function, so here's some butt-ugly C++11

 	std::this_thread::sleep_for(std::chrono::milliseconds(ticks));

+#elif defined(_WIN32)

+	Sleep(ticks);

+#else

+	usleep(ticks * 1000);

+#endif

 }