LONDON (Reuters) – Britain’s Prince Harry has hit back at “hurtful” responses to his record-selling memoir, saying he was particularly upset by the “lie” he had boasted that he had killed 25 people in Afghanistan when serving as a military helicopter pilot. In his book “Spare”, King Charles’s younger son recounts his two tours of Afghanistan, first as a forward air controller in 2007/08 and again in 2012, when he was a co-pilot gunner in Apache attack helicopters, and the number of people he had killed. British newspapers, heavily criticized in the book, and some senior former British military…