[Tizen 6.0] Support build with GCC 9.2

[Tizen 6.0] Support build with GCC 9.2

1. mgr is dependent type, not expected to be a template - so it parses as a non
template and T<..> () is invalid for anything except a template: [temp.dep.type]

  message-service.h:101:18: error: expected primary-expression before '>' token
    101 |  mgr.Register<Msg>([this](const Msg & msg) {
        |

2. Add missing include:

  obj.h:33:44: error: 'function' is not a member of 'std'
     33 | typedef std::unique_ptr<EVP_PKEY_CTX, std::function<void(EVP_PKEY_CTX *)>>
        |                                            ^~~~~~~~
  obj.h:28:1: note: 'std::function' is defined in header '<functional>';
  did you forget to '#include <functional>'?
     27 | #include <data-type.h>
    +++ |+#include <functional>

Signed-off-by: Mikhail Kashkarov <m.kashkarov@partner.samsung.com>