Structs with no tag name

[muff1n1634]

Metrowerks mangles these as struct (note the absence of the length prefix).

Found @LOCAL@get_kobj__FPstructP9DPDObject@dpd_scale in a symbol map.

I did some testing to replicate the symbol name, but also some other stuff.

Currently cwdemangle fails to demangle this, interpreting s as short and failing on t.