build: disable -Wnon-virtual-dtor compiler warning

See also named-data/NFD@0a05f7aea6

Change-Id: I8926b31bc8757684b939e5e41e80e196e644b7c6

.waf-tools/default-compiler-flags.py

@@ -128,7 +128,11 @@ class CompilerFlags:
 
     def getGeneralFlags(self, conf):
         """Get dict of CXXFLAGS, LINKFLAGS, and DEFINES that are always needed"""
-        return {'CXXFLAGS': [], 'LINKFLAGS': [], 'DEFINES': []}
+        return {
+            'CXXFLAGS': [],
+            'LINKFLAGS': [],
+            'DEFINES': ['BOOST_ASIO_NO_DEPRECATED', 'BOOST_FILESYSTEM_NO_DEPRECATED'],
+        }
 
     def getDebugFlags(self, conf):
         """Get dict of CXXFLAGS, LINKFLAGS, and DEFINES that are needed only in debug mode"""
@@ -158,7 +162,6 @@ class GccClangCommonFlags(CompilerFlags):
         '-Wpedantic',
         '-Wenum-conversion',
         '-Wextra-semi',
-        '-Wnon-virtual-dtor',
         '-Wno-unused-parameter',
     ]
     __linkFlags = ['-Wl,-O1']