update sanity.test_emcc_caching

tests/test_sanity.py

@@ -417,8 +417,8 @@ fi
 
         # Building a file that doesn't need cached stuff should not trigger cache generation
         output = self.do([compiler, path_from_root('tests', 'hello_world.cpp')])
-        assert INCLUDING_MESSAGE.replace('X', 'libc') not in output
-        assert BUILDING_MESSAGE.replace('X', 'libc') not in output
+        assert INCLUDING_MESSAGE.replace('X', 'libcextra') not in output
+        assert BUILDING_MESSAGE.replace('X', 'libcextra') not in output
         self.assertContained('hello, world!', run_js('a.out.js'))
         try_delete('a.out.js')
 
@@ -426,8 +426,8 @@ fi
         dcebc_name = os.path.join(TEMP_DIR, 'emscripten_temp', 'emcc-1-linktime.bc')
         ll_names = [os.path.join(TEMP_DIR, 'emscripten_temp', 'emcc-X-ll.ll').replace('X', str(x)) for x in range(2,5)]
 
-        # Building a file that *does* need dlmalloc *should* trigger cache generation, but only the first time
-        for filename, libname in [('hello_malloc.cpp', 'libc'), ('hello_libcxx.cpp', 'libcxx')]:
+        # Building a file that *does* need something *should* trigger cache generation, but only the first time
+        for filename, libname in [('hello_libcxx.cpp', 'libcxx')]:
           for i in range(3):
             print filename, libname, i
             self.clear()