Clean up unnecessary CMake flags
Make CPU and FPU choice more maintainable
Fix some missing include paths for configure based packages
Make sure SDL_ttf has the proper linker path so it finds the necessary libraries when linking
`set -euo pipefail`
1. Build in `build-amiga` to have a separate Amiga cmake cache.
2. Place downloaded/built dependcies into `build-amiga/deps` instead of the root directory.
3. Instructions for changing file permissions and stack size.
Co-Authored-By: Anders Jenbo <anders@jenbo.dk>
Marlon Beijer
Gleb Mazovetskiy
Anders Jenbo