regress/: Replace PF_ with AF_

[adns] / regress / case-flags10.sys

adnstest default
:1 ,aaaaaaaaaa/chiark.greenend.org.uk
 start 929580072.670441
 socket domain=AF_INET type=SOCK_DGRAM
 socket=4
 +0.000191
 fcntl fd=4 cmd=F_GETFL
 fcntl=~O_NONBLOCK&...
 +0.000084
 fcntl fd=4 cmd=F_SETFL O_NONBLOCK|...
 fcntl=OK
 +0.000061
 close fd=4
 close=OK
 +0.000001