poly1305/asm/poly1305-x86_64.pl: fix solaris64-x86_64-cc build.
poly1305/asm/poly1305-x86_64.pl: fix solaris64-x86_64-cc build.

Reviewed-by: Paul Dale <bc4a6b4cd7a8395c734c8eb5aef04a9c30188c85@oracle.com>
Reviewed-by: Rich Salz <c04971a99e5a9ee80eaab4b1deb37e845b0bd697@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/6676)

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