Enable AMD64 SHA256 implementations for WIN64
* cipher/sha256-avx-amd64.S: Enable when HAVE_COMPATIBLE_GCC_WIN64_PLATFORM_AS defined. (ELF): New macro to mask lines with ELF specific commands. * cipher/sha256-avx2-bmi2-amd64.S: Ditto. * cipher/sha256-ssse3-amd64.S: Ditto. * cipher/sha256.c (USE_SSSE3, USE_AVX, USE_AVX2): Enable when HAVE_COMPATIBLE_GCC_WIN64_PLATFORM_AS defined. [USE_SSSE3 || USE_AVX || USE_AVX2] (ASM_FUNC_ABI) (ASM_EXTRA_STACK): New. (_gcry_sha256_transform_amd64_ssse3, _gcry_sha256_transform_amd64_avx) (_gcry_sha256_transform_amd64_avx2): Add ASM_FUNC_ABI to prototypes. (transform): Add ASM_EXTRA_STACK to stack burn value.
- Signed-off-by: Jussi Kivilinna <jussi.kivilinna@iki.fi>