* remove docker build cruft
- Simplified environment variable sourcing in build scripts by using a single build-env.sh file.
- Updated Dockerfile to streamline the build process and reduce unnecessary comments.
- Enhanced setup-cross-compilation.sh to directly set target and linker variables without temporary files.
- Improved clarity and maintainability of build scripts.
* fix setup-cross-compilation.sh
- Updated the script to use a more concise syntax for exporting environment variables.
- Improved readability by using echo and conditional checks for BINDGEN_EXTRA_CLANG_ARGS.
- This change simplifies the script while maintaining functionality.
* Refactor setup-cross-compilation.sh for improved readability
- Changed the syntax for checking BINDGEN_EXTRA_CLANG_ARGS to use a conditional statement for clarity.
- This enhances the script's maintainability while preserving its functionality.