The pattern here was being too greedy because by default the longest match
is taken, and "*/" followed by more content is always longer than just
the "*/" to terminate the match.
The :>> symbol is a "finish guard" which tells Ragel to prefer to exit
from any* as soon as "*/" matches, making the match ungreedy.
The result of this is that input files containing more than one multi-line
comment will now tokenize each one separately, whereas before we would
create one long comment including everything from the first /* to the
final */ in the file, effectively causing parts of the file to be
ignored entirely.
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