Switch to std::filesystem

Change-Id: I4d5cab541a094e1260bb4b202c9f18830a2a645b
diff --git a/wscript b/wscript
index b2544c5..969d18f 100644
--- a/wscript
+++ b/wscript
@@ -24,7 +24,7 @@
     conf.check_cfg(package='libndn-cxx', args=['libndn-cxx >= 0.8.1', '--cflags', '--libs'],
                    uselib_store='NDN_CXX', pkg_config_path=pkg_config_path)
 
-    conf.check_boost(lib='date_time filesystem program_options', mt=True)
+    conf.check_boost(lib='date_time program_options', mt=True)
 
     conf.check_compiler_flags()