On darwin, providing SystemConfiguration to curl currently results in a
reference loop, so we have to disable the check for it and the feature
which requires it (NAT64).

Patching actual configure script here as we also don't want to require
autoconf in the bootstrap loop just to regenerate a patched configure.ac.

--- a/configure   2021-10-16 00:51:59.000000000 +0100
+++ b/configure   2021-10-16 01:06:46.000000000 +0100
@@ -21556,7 +221556,7 @@
     if test "x$build_for_macos" != xno; then
       { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: yes" >&5
 printf "%s\n" "yes" >&6; }
-      LDFLAGS="$LDFLAGS -framework CoreFoundation -framework CoreServices -framework SystemConfiguration"
+      LDFLAGS="$LDFLAGS -framework CoreFoundation"
     else
       { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: no" >&5
 printf "%s\n" "no" >&6; }
@@ -22211,9 +22211,6 @@
 fi
 
 
-if test "$HAVE_GETHOSTBYNAME" != "1"; then
-  as_fn_error $? "couldn't find libraries for gethostbyname()" "$LINENO" 5
-fi
 
 
 curl_includes_winsock2="\
diff --git a/lib/curl_setup.h b/lib/curl_setup.h
index b43714da7..7674778b7 100644
--- a/lib/curl_setup.h
+++ b/lib/curl_setup.h
@@ -250,20 +250,6 @@
 
 #include <curl/system.h>
 
-/*
- * Use getaddrinfo to resolve the IPv4 address literal. If the current network
- * interface doesn't support IPv4, but supports IPv6, NAT64, and DNS64,
- * performing this task will result in a synthesized IPv6 address.
- */
-#if defined(__APPLE__) && !defined(USE_ARES)
-#include <TargetConditionals.h>
-#define USE_RESOLVE_ON_IPS 1
-#  if TARGET_OS_MAC && !(defined(TARGET_OS_IPHONE) && TARGET_OS_IPHONE) && \
-     defined(ENABLE_IPV6)
-#    define CURL_MACOS_CALL_COPYPROXIES 1
-#  endif
-#endif
-
 #ifdef USE_LWIPSOCK
 #  include <lwip/init.h>
 #  include <lwip/sockets.h>