libxl_internal.h: move / add some libxl defbool #define here

They will be used by both JSON generator and parser so they should be in
header file.

Signed-off-by: Wei Liu <wei.liu2@citrix.com>
Acked-by: Ian Campbell <ian.campbell@citrix.com>

tools/libxl/libxl.c

@@ -232,10 +232,6 @@ void libxl_key_value_list_dispose(libxl_key_value_list *pkvl)
     free(kvl);
 }
 
-#define LIBXL__DEFBOOL_DEFAULT (0)
-#define LIBXL__DEFBOOL_FALSE (-1)
-#define LIBXL__DEFBOOL_TRUE (1)
-
 void libxl_defbool_set(libxl_defbool *db, bool b)
 {
     db->val = b ? LIBXL__DEFBOOL_TRUE : LIBXL__DEFBOOL_FALSE;
@@ -266,11 +262,11 @@ bool libxl_defbool_val(libxl_defbool db)
 const char *libxl_defbool_to_string(libxl_defbool b)
 {
     if (b.val < 0)
-        return "False";
+        return LIBXL__DEFBOOL_STR_FALSE;
     else if (b.val > 0)
-        return "True";
+        return LIBXL__DEFBOOL_STR_TRUE;
     else
-        return "<default>";
+        return LIBXL__DEFBOOL_STR_DEFAULT;
 }
 
 /******************************************************************************/

tools/libxl/libxl_internal.h

@@ -3036,6 +3036,14 @@ void libxl__numa_candidate_put_nodemap(libxl__gc *gc,
     libxl_bitmap_copy(CTX, &cndt->nodemap, nodemap);
 }
 
+/* Som handy macros for defbool type. */
+#define LIBXL__DEFBOOL_DEFAULT     (0)
+#define LIBXL__DEFBOOL_FALSE       (-1)
+#define LIBXL__DEFBOOL_TRUE        (1)
+#define LIBXL__DEFBOOL_STR_DEFAULT "<default>"
+#define LIBXL__DEFBOOL_STR_FALSE   "False"
+#define LIBXL__DEFBOOL_STR_TRUE    "True"
+
 /*
  * Inserts "elm_new" into the sorted list "head".
  *