fix typo in MANIFEST.in

MANIFEST.in

@@ -18,7 +18,7 @@ include Demos/freeze/*
 include Demos/libraries/*
 include Demos/Makefile*
 recursive-include Cython/Debugger/Tests *.pyx *.pxd *.c *.h
-recursive-include Cython/Utility *.pyx *.pxd *.c *.h .cpp
+recursive-include Cython/Utility *.pyx *.pxd *.c *.h *.cpp
 recursive-include Tools *
 recursive-include tests *.pyx *.pxd *.pxi *.py *.h *.BROKEN bugs.txt
 recursive-include tests *_lib.cpp *.srctree