build fix, relative path

Change-Id: I976a3dec39669a308596acbfc2366c402ee0fb05
diff --git a/wscript b/wscript
index 725c237..0f5df7c 100644
--- a/wscript
+++ b/wscript
@@ -76,7 +76,7 @@
         dest = "%s/ndn-group-encrypt" % bld.env['INCLUDEDIR'],
         files = bld.path.ant_glob(['src/**/*.hpp', 'src/**/*.h', 'common.hpp']),
         cwd = bld.path.find_dir("src"),
-        relative_trick = False,
+        relative_trick = True,
         )