target-i386: Print deprecation warning if xlevel < 0x80000000

Signed-off-by: NIgor Mammedov <imammedo@redhat.com>
Reviewed-by: NEduardo Habkost <ehabkost@redhat.com>
Signed-off-by: NAndreas Färber <afaerber@suse.de>

target-i386/cpu.c

@@ -1395,6 +1395,8 @@ static int cpu_x86_parse_featurestr(x86_def_t *x86_cpu_def, char *features)
                     goto error;
                 }
                 if (numvalue < 0x80000000) {
+                    fprintf(stderr, "xlevel value shall always be >= 0x80000000"
+                            ", fixup will be removed in future versions\n");
                     numvalue += 0x80000000;
                 }
                 x86_cpu_def->xlevel = numvalue;