Patch parse_params() to deal with BSD strtol() #129
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strtol(3) can optionally set errno to EINVAL if no conversion could be
performed and FreeBSD (at least) implements thin behaviour. Add an
explicit test to detect this situation in Dispatcher::parse_params().
(This behaviour difference is not relevant to other uses of strtol()).
This corrects the mishandling of (eg) "CSI m" on FreeBSD.