qemu-spoof: SMBIOS type0 BIOS + type1 system identity

Stock QEMU leaves type0 vendor/version/date unset (guest reads an empty/firmware-
default "SeaBIOS" BIOS via WMI/dmidecode) and type1 system manufacturer/product fall
back to the bare machine values. Force the persona identity through smbios_set_defaults:
- real-OEM persona: vendor-formatted BIOS + board-brand system manufacturer/product;
- hyperv persona: Microsoft "Virtual Machine".
Config (-smbios) still wins; an un-seeded VM stays stock. (spoof.h include added by
0015-smbios-vm-bit.)
diff --git a/hw/smbios/smbios.c b/hw/smbios/smbios.c
index 7d71418..8321f10 100644
--- a/hw/smbios/smbios.c
+++ b/hw/smbios/smbios.c
@@ -1027,6 +1027,15 @@ void smbios_set_defaults(const char *manufacturer, const char *product,
 {
     smbios_have_defaults = true;
 
+    /* qemu-spoof: a real OEM (or Hyper-V) BIOS + system identity. Stock leaves type0
+     * vendor/version/date unset (guest reads empty/"SeaBIOS") and type1 falls back to
+     * the bare machine manufacturer/product; force the persona's values. Platform-
+     * anchored; config (-smbios) still wins; inert without a seed. */
+    SMBIOS_SET_DEFAULT(smbios_type0.vendor,  spoof_bios_vendor(NULL));
+    SMBIOS_SET_DEFAULT(smbios_type0.version, spoof_bios_version(NULL));
+    SMBIOS_SET_DEFAULT(smbios_type0.date,    spoof_bios_date(NULL));
+    SMBIOS_SET_DEFAULT(smbios_type1.manufacturer, spoof_system_manufacturer(NULL));
+    SMBIOS_SET_DEFAULT(smbios_type1.product,      spoof_system_product(NULL));
     SMBIOS_SET_DEFAULT(smbios_type1.manufacturer, manufacturer);
     SMBIOS_SET_DEFAULT(smbios_type1.product, product);
     SMBIOS_SET_DEFAULT(smbios_type1.version, version);