* cmake: apply sirit unused-command-line-argument flag only with Clang
* shader_recompiler: move Opcode magic_enum range customization to opcodes.h
Define the magic_enum range for Shader::Gcn::Opcode as a proper enum_range specialization in opcodes.h instead of relying on translation-unit macros in translate.cpp.
This makes the customization visible where the enum is used and avoids the GCC linkage/build issue.
* thread: use Windows thread naming path for MinGW-w64
Switch the thread naming guard from _MSC_VER to _WIN32 so MinGW-w64 builds use the Windows SetThreadDescription implementation instead of falling through the POSIX branch.
This matches the platform rather than the compiler and avoids the MinGW-w64 build issue.
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