Suppress gcc unknown pragma warnings in specs

bandit uses some pragma that travis ci's gcc doesn't know about

project.gyp

@@ -49,6 +49,9 @@
         'spec',
         'externals/bandit',
       ],
+      'cflags': [
+        '-Wno-unknown-pragmas',
+      ],
       'sources': [
         '<!@(find spec/compiler examples/grammars -name "*.h" -or -name "*.cc")',
       ],
@@ -73,6 +76,9 @@
           'libraries': ['-lboost_regex'],
         }]
       ],
+      'cflags': [
+        '-Wno-unknown-pragmas',
+      ],
       'sources': [
         '<!@(find spec/runtime -name "*.h" -or -name "*.cc" -or -name "*.c")',
         '<!@(find examples/parsers -name "*.c")',