Names from nm tool have extra underscore

[JetForMe]

Hi there. Thanks for this tool.

Names from nm have an extra underscore in the beginning. I was hoping you could enhance your tool to accept an optional leading underscore.

$ demangle __ZN7cvflann7anyimpl14big_any_policyINS_20flann_centers_init_tEE13static_deleteEPPv
FAIL: __ZN7cvflann7anyimpl14big_any_policyINS_20flann_centers_init_tEE13static_deleteEPPv is not a valid name under the C++ ABI mangling rules
$ demangle ZN7cvflann7anyimpl14big_any_policyINS_20flann_centers_init_tEE13static_deleteEPPv
FAIL: ZN7cvflann7anyimpl14big_any_policyINS_20flann_centers_init_tEE13static_deleteEPPv is not a valid name under the C++ ABI mangling rules
$ demangle _ZN7cvflann7anyimpl14big_any_policyINS_20flann_centers_init_tEE13static_deleteEPPv
cvflann::anyimpl::big_any_policy<cvflann::flann_centers_init_t>::static_delete(void**)  _ZN7cvflann7anyimpl14big_any_policyINS_20flann_centers_init_tEE13static_deleteEPPv

Thanks!