sigreturn(2): Remove ancient compatibility warning about 4.2BSD.
The HISTORY subsection still says that sigreturn() was added in 4.3BSD.
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@ -56,10 +56,6 @@ Execution resumes at the specified pc.
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This system call is used by the trampoline code and
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.Xr longjmp 3
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when returning from a signal to the previously executing program.
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.Sh NOTES
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This system call is not available in
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.Bx 4.2
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hence it should not be used if backward compatibility is needed.
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.Sh RETURN VALUES
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If successful, the system call does not return.
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Otherwise, a value of -1 is returned and
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