[OS/2] Bug 451346: implement nativehyperlinktext to get readable URLs in the location bar autocomplete, r=wuno@lsvw

Simply use blue color as OS/2 doesn't have a system property to query this kind of color.

widget/src/os2/nsLookAndFeel.cpp

@@ -246,6 +246,9 @@ nsresult nsLookAndFeel::NativeGetColor(const nsColorID aID, nscolor &aColor)
         idx = SYSCLR_MENUHILITE;
       }
       break;
+    case eColor__moz_nativehyperlinktext:
+      aColor = NS_RGB( 0, 0, 255);
+      return res;
     default:
       idx = SYSCLR_WINDOW;
       break;