test: silence compiler warning in openssl-binding

Currently, this test generated the following compiler warning:
../binding.cc:33:30: warning:
'TLSv1_2_server_method' is deprecated [-Wdeprecated-declarations]
  const SSL_METHOD* method = TLSv1_2_server_method();
                             ^
/node/deps/openssl/openssl/include/openssl/ssl.h:1877:1:
note: 'TLSv1_2_server_method' has been explicitly marked deprecated here
DEPRECATEDIN_1_1_0(__owur const SSL_METHOD *TLSv1_2_server_method(void))
^
1 warning generated.

This commit adds -Wno-deprecated-declarations to silence this warning
for this test.

PR-URL: #26067
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Sakthipriyan Vairamani <thechargingvolcano@gmail.com>

Author: danbev

test/addons/openssl-binding/binding.gyp

@@ -8,6 +8,15 @@
           'sources': ['binding.cc'],
           'include_dirs': ['../../../deps/openssl/openssl/include'],
         }],
+        ['OS=="mac"', {
+          'xcode_settings': {
+            'OTHER_CFLAGS+': [
+              '-Wno-deprecated-declarations',
+            ],
+          },
+        }, {
+          'cflags': ['-Wno-deprecated-declarations'],
+        }],
       ],
     },
   ]