Pickup ELFIO fix for fuzzing failure #572
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Issue serge1/ELFIO#131 causes fuzzing failures. This change pulls in the latest bpf_conformance commit, which includes an updated reference to ELFIO with the fix.
The specific problem can occur when the entry size in a relocation entry is declared as being smaller then the minimum size of an relocation record, causing ELFIO to read pas the end of the section.