Grief after upgrade to macOS Sequioa 15.4

[Niall O'Reilly]

I don't know whether this needs attention by Apple or by ISC.

Something in the depths seems to have been changed (by Apple)
in a way that gives dig (and perhaps other code using
libisc-9.20.7.dylib) indigestion during release of
resources before exiting.

Here's what I'm seeing:

```
niall at m2a ~ % dig +short defo.ie
213.108.108.101
mem.c:367: INSIST(s >= size) failed, back trace
0   libisc-9.20.7.dylib                 0x000000010050bf3c 
default_callback + 72
1   libisc-9.20.7.dylib                 0x000000010050bed4 
isc_assertion_failed + 20
2   libisc-9.20.7.dylib                 0x000000010051fd30 
isc__mem_strdup + 0
3   libxml2.2.dylib                     0x00000001a7979764 
xmlCleanupCharEncodingHandlers + 96
4   libxml2.2.dylib                     0x00000001a7997cac 
xmlCleanupParser + 36
5   libisc-9.20.7.dylib                 0x0000000100532688 
isc__xml_shutdown + 12
6   libisc-9.20.7.dylib                 0x00000001005198c0 isc__shutdown 
+ 20
7   libsystem_c.dylib                   0x000000019e239944 
__cxa_finalize_ranges + 480
8   libsystem_c.dylib                   0x000000019e239704 exit + 44
9   libdyld.dylib                       0x000000019e38bdc8 
_ZNK5dyld416LibSystemHelpers6getenvEPKc + 0
10  dyld                                0x000000019dfe2c60 
_ZNK5dyld423LibSystemHelpersWrapper4exitEi + 172
11  dyld                                0x000000019dfe2b7c start + 6048
zsh: abort      dig +short defo.ie
niall at m2a ~ %
```

/Niall
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