Fix message in test

Looks like I did not "git add" the message update.

Also drop the now dead ZEND_ENUM_PROPERTY_ERROR() macro while
here.

Don't use custom object handlers for enum properties

Instead mark name/value as readonly and the class as
NO_DYNAMIC_PROPERTIES. This gives us the desired limitations
using native fe

Don't use custom object handlers for enum properties

Instead mark name/value as readonly and the class as
NO_DYNAMIC_PROPERTIES. This gives us the desired limitations
using native features.

In fact, this also fixes a bug where opcache cache slot merging
might result in a write to the name/value properties being
allowed. The readonly implementation handles this case correctly.

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