Enable AMD64 Salsa20 implementation on WIN64
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Description

Enable AMD64 Salsa20 implementation on WIN64

* cipher/salsa20-amd64.S: Enable when
HAVE_COMPATIBLE_GCC_WIN64_PLATFORM_AS defined.
(ELF): New macro to mask lines with ELF specific commands.
* cipher/salsa20.c (USE_AMD64): Enable when
HAVE_COMPATIBLE_GCC_WIN64_PLATFORM_AS defined.
[USE_AMD64] (ASM_FUNC_ABI, ASM_EXTRA_STACK): New.
(_gcry_salsa20_amd64_keysetup, _gcry_salsa20_amd64_ivsetup)
(_gcry_salsa20_amd64_encrypt_blocks): Add ASM_FUNC_ABI.
[USE_AMD64] (salsa20_core): Add ASM_EXTRA_STACK.
(salsa20_do_encrypt_stream) [USE_AMD64]: Add ASM_EXTRA_STACK.