idn: more strictly check AppleIDN errors

UIDNA API returns two error values but we were only checking one.
Checking both better aligns the behaviour with that of libidn2.

Closes #14431

docs/KNOWN_BUGS

@@ -85,7 +85,6 @@ problems may have been fixed or changed somewhat since this was written.
  11.4 HTTP test server 'connection-monitor' problems
  11.5 Connection information when using TCP Fast Open
  11.6 test cases sometimes timeout
- 11.7 AppleIDN test failures
  11.8 WinIDN test failures
 
  12. LDAP
@@ -528,12 +527,6 @@ problems may have been fixed or changed somewhat since this was written.
 
  See https://github.com/curl/curl/issues/13350
 
-11.7 AppleIDN test failures
-
- Test 1035 fail on macOS when built to use AppleIDN.
-
- See https://github.com/curl/curl/issues/14176
-
 11.8 WinIDN test failures
 
  Test 165 disabled when built with WinIDN.

lib/idn.c

@@ -106,7 +106,7 @@ static CURLcode mac_idn_to_ascii(const char *in, char **out)
         (void)uidna_nameToASCII_UTF8(idna, iconv_buffer, (int)iconv_outlen,
                                      buffer, sizeof(buffer) - 1, &info, &err);
         uidna_close(idna);
-        if(!U_FAILURE(err)) {
+        if(!U_FAILURE(err) && !info.errors) {
           *out = strdup(buffer);
           if(*out)
             return CURLE_OK;

tests/data/DISABLED

@@ -93,9 +93,6 @@
 %if bearssl
 313
 %endif
-%if AppleIDN
-1035
-%endif
 %if WinIDN
 165
 %endif