Carl Icahn has given up on his bid to buyout Oshkosh Corporation (NYSE:OSK) after less than 25 percent of the company’s shares were tendered before the deadline he had set expired. Icahn fell just short of that number with 22 percent of shares tendered. The bid valued the company with a market cap of $2.6 billion at $3 billion. Carl Icahn in late October owned 9.5% of the truck maker, but now he has slashed his stake to 4,263,043 shares, or 4.66% of the company. Carl Icahn revealed the sale of shares in two 13Ds filed with the SEC yesterday. Known for his activism and…