Fix test regarding Unix Domain Sockets on Windows

Recent Windows versions actually support Unix Domain Sockets.  Cf.
<curl/curl#3939>.

Author: cmb69

ext/curl/tests/check_win_config.phpt

@@ -43,7 +43,7 @@ TLS-SRP => No
 HTTP2 => Yes
 GSSAPI => No
 KERBEROS5 => Yes
-UNIX_SOCKETS => No
+UNIX_SOCKETS => %r(Yes|No)%r
 PSL => No
 Protocols => dict, file, ftp, ftps, gopher, http, https, imap, imaps, ldap, ldaps, pop3, pop3s, rtsp, scp, sftp, smb, smbs, smtp, smtps, telnet, tftp
 Host => %s-pc-win32