Re: test failure on Haiku

Hello,

I'm not on Haiku, but on macOS 10.14.6 and am having a similar test 
failure with m4-1.4.19 and 198.sysval:

Checking ./197.sysval
Checking ./198.sysval
@ ../doc/m4.texi:6751: Origin of test
./198.sysval: stderr mismatch
--- m4-tmp.38611/m4-xerr	2021-05-29 04:47:35.000000000 -0500
+++ m4-tmp.38611/m4-err	2021-05-29 04:47:35.000000000 -0500
@@ -0,0 +1 @@
+sh: line 1: 40596 Killed: 9               /bin/sh -c 'kill -9 $$'
Checking ./199.mkstemp

When I run the commands from the terminal that you suggested in the 
previous message, I get this:

```
[Bubble:~] nieder $ /bin/sh -c '/bin/sh -c "kill 9 \$\$"; echo $?'
/bin/sh: line 0: kill: (9) - No such process
/bin/sh: line 1: 41099 Terminated: 15          /bin/sh -c "kill 9 \$\$"
143
[Bubble:~] nieder $ (SHELL=ksh; $SHELL -c "$SHELL"' -c "kill -9 \$\$" 
2>/dev/null; echo $?')
ksh: 41102: Killed
265
```

Hanspeter