Fix warning.

c++/src/capnp/capability-test.c++

@@ -749,7 +749,7 @@ TEST(Capability, KeywordMethods) {
   kj::WaitScope waitScope(loop);
   bool called = false;
 
-  class TestKeywordMethodsImpl: public test::TestKeywordMethods::Server {
+  class TestKeywordMethodsImpl final: public test::TestKeywordMethods::Server {
   public:
     TestKeywordMethodsImpl(bool& called): called(called) {}
 

mega-test-quick.cfg

-linux-gcc-4.7       930 ./super-test.sh tmpdir capnp-gcc-4.7 quick gcc-4.7
-linux-gcc-4.8       929 ./super-test.sh tmpdir capnp-gcc-4.8 quick gcc-4.8
-linux-clang         959 ./super-test.sh tmpdir capnp-clang quick clang
-mac                 884 ./super-test.sh remote beat caffeinate quick
-cygwin              923 ./super-test.sh remote Kenton@flashman quick
+linux-gcc-4.7       932 ./super-test.sh tmpdir capnp-gcc-4.7 quick gcc-4.7
+linux-gcc-4.8       932 ./super-test.sh tmpdir capnp-gcc-4.8 quick gcc-4.8
+linux-clang         962 ./super-test.sh tmpdir capnp-clang quick clang
+mac                 886 ./super-test.sh remote beat caffeinate quick
+cygwin              925 ./super-test.sh remote Kenton@flashman quick