Enable AMD64 Whirlpool implementation for WIN64
* cipher/whirlpool-sse2-amd64.S: Enable when HAVE_COMPATIBLE_GCC_WIN64_PLATFORM_AS defined. (ELF): New macro to mask lines with ELF specific commands. * cipher/whirlpool.c (USE_AMD64_ASM): Enable when HAVE_COMPATIBLE_GCC_WIN64_PLATFORM_AS defined. [USE_AMD64_ASM] (ASM_FUNC_ABI, ASM_EXTRA_STACK): New. [USE_AMD64_ASM] (_gcry_whirlpool_transform_amd64): Add ASM_FUNC_ABI to prototype. [USE_AMD64_ASM] (whirlpool_transform): Add ASM_EXTRA_STACK to stack burn value.
- Signed-off-by: Jussi Kivilinna <jussi.kivilinna@iki.fi>