Threaded FFI returns ExternalAddress instead of an ExternalStructure

[akgrant43]

E.g.:

LGitCommit>>commit_author: commit
	
	^ self
		call: #(LGitSignature * git_commit_author #(self))
		options: #()

answers an ExternalAddress. This can be worked around by modifying the calling method:

LGitCommit>>author
	^ LGitSignature fromHandle: (self commit_author: self)

but this shouldn't be required (as I understand it from Esteban).

Thanks,
Alistair

[estebanlm]

yes, but this is a workaround :)
TFFI needs to answer the structure object.