Some controller signals only work on unix

control_signal_check() and control_signal_act hard-code the signal numbers to be the ones used in unix.

But handle_control_signal() uses the system-defined values for them.

One of these behaviors is wrong.

E.g., USR1 and USR2 (among possibly others) don't work on OS X from the controller.

[Automatically added by flyspray2trac: Operating System: All]

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