Enable AMD64 ChaCha20 implementations on WIN64
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Description

Enable AMD64 ChaCha20 implementations on WIN64

* cipher/chacha20-avx2-amd64.S: Enable when
HAVE_COMPATIBLE_GCC_WIN64_PLATFORM_AS defined.
(ELF): New macro to mask lines with ELF specific commands.
* cipher/chacha20-sse2-amd64.S: Enable when
HAVE_COMPATIBLE_GCC_WIN64_PLATFORM_AS defined.
(ELF): New macro to mask lines with ELF specific commands.
* cipher/chacha20-ssse3-amd64.S: Enable when
HAVE_COMPATIBLE_GCC_WIN64_PLATFORM_AS defined.
(ELF): New macro to mask lines with ELF specific commands.
* cipher/chacha20.c (USE_SSE2, USE_SSSE3, USE_AVX2): Enable when
HAVE_COMPATIBLE_GCC_WIN64_PLATFORM_AS defined.
(ASM_FUNC_ABI, ASM_EXTRA_STACK): New.
(chacha20_blocks_t, _gcry_chacha20_amd64_sse2_blocks)
(_gcry_chacha20_amd64_ssse3_blocks, _gcry_chacha20_amd64_avx2_blocks)
(_gcry_chacha20_armv7_neon_blocks, chacha20_blocks): Add ASM_FUNC_ABI.
(chacha20_core): Add ASM_EXTRA_STACK.