replace math_graphics with glm version 1.0.3

libs/glm/test/gtc/gtc_constants.cpp

@@ -0,0 +1,30 @@
+#include <glm/gtc/constants.hpp>
+
+static int test_epsilon()
+{
+	int Error = 0;
+
+	{
+		float Test = glm::epsilon<float>();
+		Error += Test > 0.0f ? 0 : 1;
+	}
+
+	{
+		double Test = glm::epsilon<double>();
+		Error += Test > 0.0 ? 0 : 1;
+	}
+
+	return Error;
+}
+
+int main()
+{
+	int Error(0);
+
+	//float MinHalf = 0.0f;
+	//while (glm::half(MinHalf) == glm::half(0.0f))
+	//	MinHalf += std::numeric_limits<float>::epsilon();
+	Error += test_epsilon();
+	
+	return Error;
+}