poly1305/asm/poly1305-x86_64.pl: MacOS X portability fix.
poly1305/asm/poly1305-x86_64.pl: MacOS X portability fix.

Reviewed-by: Viktor Dukhovni <86faeb3e05561b856666236e198c27e698275e82@openssl.org>

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