tests: fix stack overflow test case for old gmake.

* tests/012/stack.tl: The (if stack-limited ...) test is not
correct because even if gerlimit indicates an unlimited stack,
we impose a defualt limit, and so (get-stack-limit) returns a
an integer value. The idea here was to try to skip this test
case when the stack usage is unlmited, which happens under
older versions of GNU make, before posix_spawn was introduced.
Instead, let's execute this test case only if we have
setrlimit. In the forked child, we try to impose a small stack
limit that will give use the stack overflow crash we are
testing for. The objective of the test case is to validate
that when (set-stack-limit 0) is called, the child will abort
due to a signal, rather than (recur) returning :so.

0 files changed, 0 insertions, 0 deletions