Avoid clobbering non-volatile XMM registers

Avoid clobbering non-volatile XMM registers

This affects some Poly1305 assembler functions
which are only used for certain CPU types.

Remove those functions for Windows targets,
as a simple interim solution.

Fixes #21522

Reviewed-by: Tomas Mraz <tomas@openssl.org>
Reviewed-by: Paul Dale <pauli@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/21808)