Summary of Changes

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This pull request refactors the mruby build configuration for the Sega Dreamcast to enhance its simplicity, stability, and maintainability. It achieves this by delegating the management of complex compiler and linker settings to KallistiOS's dedicated build wrappers, thereby abstracting away low-level toolchain specifics from the mruby configuration file. This change directly addresses and fixes a known compilation issue within the kos-ports project.

Highlights

• Build Configuration Simplification: The dreamcast_shelf.rb build configuration has been significantly simplified by replacing explicit compiler, linker, and archiver commands and their numerous flags/paths with calls to KallistiOS (KOS) build wrappers (kos-cc, kos-c++, kos-ld, kos-ar). This abstracts away the low-level toolchain details.
• Dependency on KOS Wrappers: The build process now relies on the presence and correct configuration of the KOS build wrappers located in KOS_BASE/utils/build_wrappers. This centralizes KOS-specific build logic within the KOS project itself.
• Reduced Environment Variable Dependency: The KOS_CC_BASE environment variable is no longer required or checked, streamlining the setup process. Only KOS_BASE is now necessary for the build configuration.
• Improved Maintainability and Stability: By leveraging KOS wrappers, the mruby build configuration becomes more robust against internal changes in KallistiOS's toolchain paths or default flags, reducing the maintenance burden and stabilizing the compilation process.

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