fixes for GCC .so/exception problems

[SVN r13471]

example/richcmp3.cpp

@@ -12,7 +12,7 @@ namespace vects { \
   operator##oper (const vect_type1& lhs, const vect_type2& rhs) { \
     if (lhs.size() != rhs.size()) { \
       PyErr_SetString(PyExc_ValueError, "vectors have different sizes"); \
-      throw boost::python::error_already_set(); \
+      boost::python::throw_error_already_set(); \
     } \
     result_type result(lhs.size()); \
     for (std::size_t i=0; i<lhs.size(); i++) { \