C++: fix digraph parsing for <:: exception.
According to section 2.5 from the standard: """ If the input stream has been parsed into preprocessing tokens up to a given character: ... Otherwise, if the next three characters are <:: and the subsequent character is neither : nor >, the < is treated as a preprocessor token by itself and not as the first character of the alternative token <:. """ Change-Id: Ib9cdac61e3c2243d1bc1d4471a09ae6bd839fdda Task-number: QTCREATORBUG-13253 Reviewed-by: Nikolai Kosjar <email@example.com>
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