Define pure virtuals in libresource for ubsan compat
Define pure virtuals in libresource for ubsan compat

Summary: These methods had no definitions, which causes UBSAN to choke during linking.

Reviewed By: dariorussi

Differential Revision: D3314747

fbshipit-source-id: cfb18e91d5752b0aa81a51e93affd4d50c9f505a

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