fix(candle-kernels): conditionally link stdc++ for non-MSVC targets #3278
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On Windows with MSVC, linking against stdc++ fails because it is a GNU/GCC library that does not exist in the MSVC toolchain. MSVC uses its own C++ runtime which is linked automatically. This fix wraps the stdc++ link directive in a target check, matching the existing pattern in candle-flash-attn/build.rs. Fixes huggingface#3277
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On Windows with MSVC, linking against stdc++ fails because it is a GNU/GCC library that does not exist in the MSVC toolchain. MSVC uses its own C++ runtime which is linked automatically.
This fix wraps the stdc++ link directive in a target check, matching the existing pattern in candle-flash-attn/build.rs.
Fixes #3277