PSPP-BUG: [bug #25466] Compile problem on wilcoxon.c

[Ben Pfaff]

Follow-up Comment #10, bug #25466 (project pspp):

>a) if we end up using routines from a third party library, then 
>this won't be available to us

longjmp() from a signal handler out of arbitrary third-party code seems to be
courting disaster.  At the very least it invites memory leaks.

>b) Executing the test condition would have slowed the system even 
>more. 

If you do it right then you don't put the test in your innermost loop and the
test is only a pair of test-and-jump instructions that the CPU branch
predictor always gets right.

The model checking code contains something like this.

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