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Exclude signal-related symbols on VMS without home-grown signalling.
config.h defines KILL_BY_SIGPRC when we are using our own signal
handling functions based on the sys$sigprc system service. But
when *not* doing that, and since using makedef.pl to define our
exportable symbols, we have not properly excluded the symbols
involved in the home-grown implementation. It's not a common
configuration, but since it's configurable, it should work, and
now it will.