Support loading and launching statically linked executables

[wkozaczuk]

That should be relatively easy and roughly match for these commits on the static-elf branch do:

• a2de1ca
• fa19f90
• 642158a (I think that most of it are implemented as we support position dependant dynamically-linked ELFs)
• 463ca65
• cdc758b

Please note that implementing this is not enough to fully support the execution of statically linked executables. For that we need to implement other issues:

• Implement subset of arch_prctl syscall to support local-exec TLS of statically linked executables #1137
• Implement brk syscall to support statically linked executables #1138
• Implement subset of the clone syscall to support statically linked executables #1139

[wkozaczuk]

There are many good reviews/comments in this RFC patch (the @penberg's attempt to support statically linked executables from 7 years ago) - https://groups.google.com/g/osv-dev/c/PW3bkaVCuMg/m/g_bSFzJ4fVcJ. It seems that some elements like the support of futex and SYSCALL had been added then and improved over the years.