8211106: [windows] Update OS detection code to recognize Windows Server 2019

Reviewed-by: alanb, clanger, bobv

src/os/windows/vm/os_windows.cpp

@@ -1756,9 +1756,15 @@ void os::win32::print_windows_version(outputStream* st) {
   case 6004:
     if (is_workstation) {
       st->print("10");
+    } else {
+      // distinguish Windows Server 2016 and 2019 by build number
+      // Windows server 2019 GA 10/2018 build number is 17763
+      if (build_number > 17762) {
+        st->print("Server 2019");
       } else {
         st->print("Server 2016");
       }
+    }
     break;
 
   default: