build system - rework

[janmojzis]

New upcoming release (20250101) will have a completely redesigned, simpler build system. It will have support for ext. libraries librandombytes, lib25519, libntruprime. The tests will be separate from the build part.

goals:

add support for ext. libraries

• [x] - librandombytes
• [x] - lib25519
• [x] - libntruprime

simplify build system, ideally simple Makefile

• [x] - build (make)
• [ ] - install (make install)

cleanup in the code

• [ ] - use clang-format
• [ ] - remove compiler warnings (clang -Weverything)

improve tests

• [ ] - add valgrind support
• [ ] - add valgrind tests

[janmojzis]

First pre-release: https://github.com/janmojzis/tinyssh/releases/tag/20241111