Update pthread stack size to work around NetBSD bug#79
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On NetBSD (i386, other architectures untested), the program segfaults in when getaddrinfo() is called from a thread with a small stack size:
https://mail-index.netbsd.org/tech-userlevel/2021/11/28/msg013174.html
I've tweaked the pthread_attr_setstacksize() up a bit to prevent this.