Attempt to enable macOS CI build

Author: alinaliBQ

cpp/src/arrow/flight/sql/odbc/odbc_impl/config/configuration.cc

@@ -44,6 +44,9 @@ std::string ReadDsnString(const std::string& dsn, std::string_view key,
 
 #define BUFFER_SIZE (1024)
   std::vector<wchar_t> buf(BUFFER_SIZE);
+
+  // TODO enable unicode support on macOS and Linux and remove the ifdef
+#if defined _WIN32
   int ret =
       SQLGetPrivateProfileString(wdsn.c_str(), wkey.c_str(), wdflt.c_str(), buf.data(),
                                  static_cast<int>(buf.size()), L"ODBC.INI");
@@ -59,6 +62,8 @@ std::string ReadDsnString(const std::string& dsn, std::string_view key,
   std::wstring wresult = std::wstring(buf.data(), ret);
   CONVERT_UTF8_STR(const std::string result, wresult);
   return result;
+#endif  // defined(_WIN32)
+  return std::string("");
 }
 
 void RemoveAllKnownKeys(std::vector<std::string>& keys) {
@@ -79,6 +84,8 @@ std::vector<std::string> ReadAllKeys(const std::string& dsn) {
 
   std::vector<wchar_t> buf(BUFFER_SIZE);
 
+// TODO enable unicode support on macOS and Linux and remove the ifdef
+#if defined _WIN32
   int ret = SQLGetPrivateProfileString(wdsn.c_str(), NULL, L"", buf.data(),
                                        static_cast<int>(buf.size()), L"ODBC.INI");
 
@@ -88,6 +95,7 @@ std::vector<std::string> ReadAllKeys(const std::string& dsn) {
     ret = SQLGetPrivateProfileString(wdsn.c_str(), NULL, L"", buf.data(),
                                      static_cast<int>(buf.size()), L"ODBC.INI");
   }
+#endif  // defined(_WIN32)
 
   // When you pass NULL to SQLGetPrivateProfileString it gives back a \0 delimited list of
   // all the keys. The below loop simply tokenizes all the keys and places them into a