cope with printf macro definition in readline.c

Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Nmalc <av1474@comtv.ru>

readline.c

@@ -28,6 +28,7 @@
 #define IS_ESC  1
 #define IS_CSI  2
 
+#undef printf
 #define printf do_not_use_printf
 
 void readline_show_prompt(ReadLineState *rs)