Make bumpmapping compatible with irrlicht 1.8

Author: EXio4

src/game.cpp

@@ -807,7 +807,12 @@ class GameGlobalShaderConstantSetter : public IShaderConstantSetter
 
 		// Normal map texture layer
 		int layer = 1;
+		// before 1.8 there isn't a "integer interface", only float
+#if (IRRLICHT_VERSION_MAJOR == 1 && IRRLICHT_VERSION_MINOR < 8)
 		services->setPixelShaderConstant("normalTexture" , (irr::f32*)&layer, 1);
+#else
+		services->setPixelShaderConstant("normalTexture" , (irr::s32*)&layer, 1);
+#endif
 	}
 };