fix header

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@46175 15284696-431f-4ddb-bdfa-cd5b030d7da7

lib/vector/rtree/index.h

@@ -20,6 +20,7 @@
 
 #include <stdio.h>
 #include <sys/types.h>
+#include <grass/config.h>
 
 /* PGSIZE is normally the natural page size of the machine */
 #define PGSIZE	512