The code flushes the cache on VIA processors unconditionally which
is excessive. Check for cpuid family and execute wbinvd only on C3
and earlier.
Fixes: https://savannah.gnu.org/bugs/?45149
Fixes: 25492a0f0 (Add wbinvd around bios call.)
Signed-off-by: ValdikSS <iam@valdikss.org.ru>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>