Fix WIN64 assembly glue for AES

* cipher/rinjdael.c (do_encrypt, do_decrypt)
[!HAVE_COMPATIBLE_GCC_AMD64_PLATFORM_AS]: Change input operands to
input+output to mark volatile nature of the used registers.

Function arguments cannot be passed to assembly block as input operands
as target function modifies those input registers.

• Signed-off-by: Jussi Kivilinna <jussi.kivilinna@iki.fi>