According to the headers I have available, Unity v5.3.2f1 (metadata 19)
lacks the referencedAssemblies{Offset,Count} fields in
Il2CppGlobalMetadataHeader. These appear to have been added some time
between that version and 5.3.3f1 (metadata 20).
Changing these fields makes the Inspector work properly on the output from
Il2Cpp from Unity v5.3.2f1.
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