sha1-x86_64.pl: harmonize Win64 SE handlers for SIMD code pathes. (and ensure stack alignment in the process)
sha1-x86_64.pl: harmonize Win64 SE handlers for SIMD code pathes.
(and ensure stack alignment in the process)

openssl/openssl,openssl/openssl,openssl/openssl,openssl/openssl,openssl/openssl,openssl/openssl