Remove High Sierra build warning

src/qt/feirm.cpp

@@ -572,18 +572,6 @@ int main(int argc, char* argv[])
     initTranslations(qtTranslatorBase, qtTranslator, translatorBase, translator);
     uiInterface.Translate.connect(Translate);
 
-#ifdef Q_OS_MAC
-#if __clang_major__ < 4
-    QString s = QSysInfo::kernelVersion();
-    std::string ver_info = s.toStdString();
-    // ver_info will be like 17.2.0 for High Sierra. Check if true and exit if build via cross-compile
-    if (ver_info[0] == '1' && ver_info[1] == '7') {
-        QMessageBox::critical(0, "Unsupported", BitcoinGUI::tr("High Sierra not supported with this build") + QString("\n\n"));
-        ::exit(1);
-    }
-#endif
-#endif
-
     // Show help message immediately after parsing command-line options (for "-lang") and setting locale,
     // but before showing splash screen.
     if (mapArgs.count("-?") || mapArgs.count("-help") || mapArgs.count("-version")) {