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Move portability macros to `lib/common/portability_macros.h`. This file only contains platform/feature detection (e.g. 0/1 macros). This file is shared between C and ASM code, so it cannot include any C code. Rename `HUF_` ASM macros to be `ZSTD_` prefixed, and move to the new header. Restrict `ZSTD_ASM_SUPPORTED` to `__GNUC__`, because we need the GAS assembler. Finally, only include the ASM code if we are actually going to use it. This disables it on all Windows platforms, which should resolve the problem brought up in Issue #2789.