compat: replace PC_COMPAT_2_5 & HW_COMPAT_2_5 macros

Use static arrays instead.

Suggested-by: Eduardo Habkost <ehabkost@redhat.com>
Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Igor Mammedov <imammedo@redhat.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Acked-by: Eduardo Habkost <ehabkost@redhat.com>
diff --git a/hw/i386/pc.c b/hw/i386/pc.c
index 6c8ff0e..8eb69ff 100644
--- a/hw/i386/pc.c
+++ b/hw/i386/pc.c
@@ -281,6 +281,9 @@
 };
 const size_t pc_compat_2_6_len = G_N_ELEMENTS(pc_compat_2_6);
 
+GlobalProperty pc_compat_2_5[] = {};
+const size_t pc_compat_2_5_len = G_N_ELEMENTS(pc_compat_2_5);
+
 void gsi_handler(void *opaque, int n, int level)
 {
     GSIState *s = opaque;