ELFVersion.jl additions

[mlechu]

I used ObjectFile to write a script to patch versions in ELF files and decided some parts of it might belong here.

• Of the four version definition/requirement structs (verdef, verdaux, verneed, vernaux), we're missing the fourth, so add it
• Fix ELFVersionData not working if it doesn't find a .gnu.version_d section:

  julia> ELFVersionData(oh)
  ERROR: MethodError: no method matching section_offset(::Nothing)
  The function `section_offset` exists, but no method is defined for this combination of argument types.
  

• Add ELFVersionNeededData, a similar function for version requirements (.gnu.version_r)
• Add elf hash function used in version definitions and requirements (see https://en.wikipedia.org/wiki/PJW_hash_function)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 69.00%. Comparing base (427b624) to head (c357a27).
Report is 4 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #51      +/-   ##
==========================================
+ Coverage   68.09%   69.00%   +0.90%     
==========================================
  Files          46       46              
  Lines        1332     1371      +39     
==========================================
+ Hits          907      946      +39     
  Misses        425      425              

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[mlechu]

Nightly won't work at the moment due to JuliaLang/julia#57699

[topolarity]

Can you add some tests for the new functionality? 🙂

[topolarity]

Nice changes! Easy to read, and test coverage looks good.

Thanks much @mlechu !

[topolarity]

@giordano or @staticfloat , is it possible to get a quick review here?

Changes look complete to me, nightly is only failing because of JuliaLang/julia#57755

[staticfloat]

Looks good to me!