Fix setup scripts.

Support _msgpack.cpp

MANIFEST.in

@@ -1,5 +1,5 @@
 include setup.py
 include COPYING
-recursive-include msgpack *.h *.c *.pyx
+recursive-include msgpack *.h *.c *.pyx *.cpp
 recursive-include test *.py
 recursive-include test3 *.py

setup.py

@@ -37,7 +37,7 @@ if have_cython:
                                         cython_compiler.default_options)
             sdist.__init__(self, *args, **kwargs)
 else:
-    sources = ['msgpack/_msgpack.c']
+    sources = ['msgpack/_msgpack.cpp']
 
     for f in sources:
         if not os.path.exists(f):