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Track and use length of variable length structs and their varsized array

Bitbucket Importer requested to merge bitbucket/merged-pr-71 into branch/default

Created originally on Bitbucket by coronafire (Andrew Leech)

Was already merged in Bitbucket before import, marked as merged by the import user

As discussed in issue #284

This changeset records the allocated memory size when creating a new struct, which can then be used directly when getting ffi.buffer() on said struct.

This is particularly useful when variable sized structs are used, as the typedef/sizeof does not directly relate the size of the allocated size.

This information can also be used when accessing the varsized_array[] field of the struct to return an array of the correct allocated size.

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