perlasm/x86_64-xlate.pl: address errors and warnings in elderly perls.
perlasm/x86_64-xlate.pl: address errors and warnings in elderly perls.

Reviewed-by: Rich Salz <c04971a99e5a9ee80eaab4b1deb37e845b0bd697@openssl.org>

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