Fix rust syntax file to recognize byte strings and c strings. #3452
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In rust, there are some prefixes that may be part of the string literal. String literals of the form b"test" (and br##"test"## etc) are byte strings (as opposed to unicode strings), and similarly, string literals of the form c"test" are C zero-terminated strings. Hence, added optional prefixes to each of the string regular expressions so the prefix will be recognized as part of the string.
Built and tested after fix.