fix(0025): use spoof_enabled() not spoof_on() at the smbios call site

spoof_on() is internal (spoof-core.h); the smbios.c call site only includes the public
spoof.h, which exposes spoof_enabled() (== spoof_on). Fixes the base build:
implicit-declaration / nested-externs -Werror.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

patches/0025-smbios-ports-slots.patch

@@ -17,7 +17,7 @@ index 7d71418..140b42a 100644
 +    /* qemu-spoof: real boards expose port connectors (type 8) and expansion slots
 +     * (type 9); QEMU emits none, so dmidecode is conspicuously empty. Inject a
 +     * plausible desktop default set when none were configured. Inert without a seed. */
-+    if (spoof_on() && QTAILQ_EMPTY(&type8)) {
++    if (spoof_enabled() && QTAILQ_EMPTY(&type8)) {
 +        static const struct { const char *intr, *extr; uint8_t ct, pt; } sp_ports[] = {
 +            { "JUSB1", "USB1",     0x12, 0x10 },  /* Access Bus (USB) / USB */
 +            { "JUSB2", "USB2",     0x12, 0x10 },
@@ -36,7 +36,7 @@ index 7d71418..140b42a 100644
 +            QTAILQ_INSERT_TAIL(&type8, t8, next);
 +        }
 +    }
-+    if (spoof_on() && QTAILQ_EMPTY(&type9)) {
++    if (spoof_enabled() && QTAILQ_EMPTY(&type9)) {
 +        static const struct {
 +            const char *desig; uint8_t type, width, usage, length; uint16_t id;
 +        } sp_slots[] = {