rename HOST_BSD to CONFIG_BSD

Signed-off-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
diff --git a/dyngen-exec.h b/dyngen-exec.h
index c1072cd..18819e4 100644
--- a/dyngen-exec.h
+++ b/dyngen-exec.h
@@ -39,7 +39,7 @@
 /* XXX: This may be wrong for 64-bit ILP32 hosts.  */
 typedef void * host_reg_t;
 
-#ifdef HOST_BSD
+#ifdef CONFIG_BSD
 typedef struct __sFILE FILE;
 #else
 typedef struct FILE FILE;