Stack overflow check does not work with qemu linux-user emulation

[Andreas Schwab]

$ echo 'define(a,a(a))a' | qemu-x86_64 src/m4
src/m4: internal error detected; please report this bug to <bug-m4@gnu.org>: 
Segmentation fault

-- 
Andreas Schwab, SUSE Labs, sch...@suse.de
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