Support for Autotools build system

**Is your feature request related to a problem? Please describe.**

I'm trying to integrate zstd into a workflow where I build GCC and binutils. I'm interested in using binutils' linker to generate and read debug sections, compressed using zstd, from ELF files.

Currently, I build all these components using the Autotools build system and wanted to do the same for the zstd build step, but it seems it does not support that. Are there any plans to add support for Autotools in zstd?

**Describe the solution you'd like**
Autotools.

**Describe alternatives you've considered**
Bazel and CMake, but I would prefer to avoid them if possible.

**Additional context**
No more context.