Fix compilation when using MASM on x86

The generated asm code from x86cpuid.pl contains CMOVE instructions
which are only available on i686 and later CPUs.

Reviewed-by: Andy Polyakov <appro@openssl.org>
Reviewed-by: Rich Salz <rsalz@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/1459)