use GraphicsSettings.HasShaderDefine for future Unity builds

Assets/ScriptableRenderPipeline/common/TextureCache.cs

                 var probeFormat = TextureFormat.BC6H;
 
                 // On editor the texture is uncompressed when operating against mobile build targets
+#if UNITY_2017_2_OR_NEWER
+                if (SystemInfo.SupportsTextureFormat(probeFormat) && !UnityEngine.Rendering.GraphicsSettings.HasShaderDefine(UnityEngine.Rendering.BuiltinShaderDefine.UNITY_NO_DXT5nm))
+                    format = probeFormat;
+#else
+#endif
 
                 return format;
             }
         {
             get
             {
+#if UNITY_2017_2_OR_NEWER
+                return !UnityEngine.Rendering.GraphicsSettings.HasShaderDefine(UnityEngine.Rendering.BuiltinShaderDefine.UNITY_NO_CUBEMAP_ARRAY);
+#else
+#endif
             }
         }