elf.h

### Comment:

I believe this feedstock provides elf.h to conda recipes out in the wild.

On my host ubuntu 20.04 machine.

My compiler uses elf.h from /usr/include/elf.h

Apparently this comes from the ubuntu package libc6-dev

When I run the build inside of an anaconda environment, a different version of elf.h is used.

. /home/blozano/anaconda3/conda-bld/tt-metalium_1737501347205/_build_env/x86_64-conda-linux-gnu/sysroot/usr/include/elf.h

The file in the Anaconda environment is not as modern as the one that ships with ubuntu 20.04 which is sad.

It does not have RISCV details.

As I understand it, this file is a part of glibc.

How can I bring a newer version of elf.h into my conda build environment?