New Delhi, June 12 : Flipkart Co-founder Binny Bansal has sold his stake worth $264 million (more than Rs 2,000 crore) in the homegrown e-commerce platform to Chinese Internet giant Tencent, at a time when the neighbouring country has once again hardened its positions along the Indian border.The news about Bansal selling Flipkart stock to Tencent came at a time when US Secretary of Defense, Lloyd Austin, said on Saturday that China is hardening its positions along the Indian border.Addressing the Shangri-La Dialogue in Singapore, Austin said that China is taking aggressive and illegal approaches to the territories it claims…