MacOS: Enable libresolv support for retrieving DNS servers like iOS does.

CMakeLists.txt

@@ -137,7 +137,7 @@ return 0;
 	MACOS_V1012)
 ENDIF ()
 
-IF (IOS AND HAVE_LIBRESOLV)
+IF ((IOS OR APPLE) AND HAVE_LIBRESOLV)
 	SET (CARES_USE_LIBRESOLV 1)
 ENDIF()
 

configure.ac

@@ -354,27 +354,12 @@ if test "$HAVE_GETHOSTBYNAME" != "1"; then
   AC_MSG_ERROR([couldn't find libraries for gethostbyname()])
 fi
 
-dnl resolv lib for iPhone
+dnl resolv lib for Apple (MacOS and iOS)
 AS_IF([test "x$host_vendor" = "xapple"], [
-  AC_MSG_CHECKING([for iPhone target])
-  AC_COMPILE_IFELSE([
-    AC_LANG_PROGRAM([[
-#include "TargetConditionals.h"
-    ]], [[
-#if TARGET_OS_IPHONE == 0
-#error Not an iPhone target
-#endif
-return 0;
-    ]])
-  ],[
-    AC_MSG_RESULT([yes])
-    AC_SEARCH_LIBS([res_servicename], [resolv], [
-      AC_DEFINE([CARES_USE_LIBRESOLV], [1], [Use resolver library to configure cares])
-    ], [
-      AC_MSG_ERROR([Unable to find libresolv which is required for iPhone targets])
-    ])
-  ],[
-    AC_MSG_RESULT([no])
+  AC_SEARCH_LIBS([res_servicename], [resolv], [
+    AC_DEFINE([CARES_USE_LIBRESOLV], [1], [Use resolver library to configure cares])
+  ], [
+    AC_MSG_ERROR([Unable to find libresolv which is required for iPhone targets])
   ])
 ])