Gold was on track for its biggest weekly loss in six on Friday, as escalating US-Iran clashes lifted oil prices, adding to inflationary pressures and strengthening the case for higher US interest rates. Spot gold was up 0.3% at $3,980.64 per ounce by 0455 GMT, having touched its lowest since July 1 earlier in the session. US gold futures for August delivery lost 0.2% at $3,984.10. The metal,