VMS config: Typo fix, as -> AS
VMS config: Typo fix, as -> AS

This typo prevented ia64 assembler to be compiled on VMS

Reviewed-by: Tim Hudson <eb0be8e447f673b41b10eda09d63cd72526b0a42@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/7700)

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