we now use GCC for compiling instead of Clang

[inayayousfi]

This pull request updates the Windows build workflow for axidev-io to use MinGW-w64 GCC via MSYS2 instead of the previously used LLVM-MinGW toolchain. The changes streamline the build process, clarify architecture support, and ensure proper environment setup for building, testing, and packaging on Windows.

Migration to MinGW-w64 GCC via MSYS2:

• Updated workflow to use MSYS2 with MinGW-w64 GCC, replacing LLVM-MinGW and its custom installation steps. This includes setting up the appropriate MSYS2 environment and installing required packages for the selected architecture (x86 or x64).
• Changed shell invocations for build, test, and install steps to use the MSYS2 shell, ensuring commands are executed in the correct environment. [1] [2] [3]

Configuration and Documentation Improvements:

• Revised the workflow name and description to clarify that it uses MinGW-w64 GCC (linked against libstdc++) rather than LLVM-MinGW.
• Updated the supported architectures to x86 and x64, removing references to arm64 and LLVM-MinGW version input.

Build Configuration Adjustments:

• Simplified CMake configuration by removing custom compiler selection logic and defaulting to Ninja generator with MinGW-w64 GCC.
• Retained static linking of libstdc++ and libgcc to avoid runtime DLL dependencies, updating comments for clarity.

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