[cpp] Remove macro based sys.db classes from cppia HostClasses

std/cpp/cppia/HostClasses.hx

@@ -59,10 +59,6 @@ class HostClasses
    "StringBuf",
    "sys.db.Mysql",
    "sys.db.Sqlite",
-   "sys.db.Object",
-   "sys.db.Manager",
-   "sys.db.Connection",
-   "sys.db.Object",
    "sys.FileSystem",
    "sys.io.File",
    "sys.io.FileInput",