util.h: Delete unused get_smbios_entry_point() prototype

The get_smbios_entry_point() function doesn't exist, delete
unused prototype.

Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
diff --git a/src/util.h b/src/util.h
index 0de3522..652ca6b 100644
--- a/src/util.h
+++ b/src/util.h
@@ -88,7 +88,6 @@
 void acpi_reboot(void);
 void find_acpi_features(void);
 extern struct smbios_entry_point *SMBiosAddr;
-struct smbios_entry_point *get_smbios_entry_point();
 void copy_smbios(void *pos);
 void display_uuid(void);
 void copy_table(void *pos);