By Simon Jessop LONDON (Reuters) - A call by Donald Trump to ditch quarterly corporate reporting has received cautious support from an unlikely source: international investors pushing business to do more on longer-term sustainability issues, many lambasted by the U.S. president. Trump on Monday called for companies to shift to six-monthly updates, adding his voice to those of business heavyweights including Berkshire Hathaway Chair Warren Buffett and JPMorgan CEO Jamie Dimon, who have argued in the past ...