[libc++] Avoid including <features.h> on arbitrary platforms (#125587) This partially reverts commit 5f2389d4. That commit started checking whether <features.h> was a valid include unconditionally, however codebases are free to have such a header on their search path, which breaks compilation. LLVM libc now provides a more standard way of getting configuration macros like __LLVM_LIBC__. After this patch, we only include <features.h> when we're on Linux or when we're compiling for GPUs.
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