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RETSIGTYPE, SIGRETURN, and SIGDEFARG are always defined the same, so inline them for simplicity; SIGDUMMYARG, however, is unused, so remove it. Even if these things don't work on windows, the signal handler in if_cscope.c is already wrapped with '#idef UNIX', as is its only call site. Reviewed-by: Justin M. Keyes <justinkz@gmail.com>