Add some more symbols to libapt-pkg5.0.symbols

David added some more when he changed the output format for
numbers.

Gbp-Dch: ignore

debian/libapt-pkg5.0.symbols

@@ -1597,3 +1597,7 @@ libapt-pkg.so.5.0 libapt-pkg5.0 #MINVER#
  (c++)"EDSP::WriteRequest(pkgDepCache&, FileFd&, unsigned int, OpProgress*)@APTPKG_5.0" 1.3~exp2
  (c++)"EDSP::WriteScenario(pkgDepCache&, FileFd&, OpProgress*)@APTPKG_5.0" 1.3~exp2
  (c++)"EDSP::WriteSolution(pkgDepCache&, FileFd&)@APTPKG_5.0" 1.3~exp2
+ (c++)"int __gnu_cxx::__stoa<long, int, char, int>(long (*)(char const*, char**, int), char const*, char const*, unsigned long*, int)@APTPKG_5.0" 1.3~exp2
+ (c++)"std::basic_istream<char, std::char_traits<char> >& std::operator>><char, std::char_traits<char> >(std::basic_istream<char, std::char_traits<char> >&, std::_Get_time<char>)@APTPKG_5.0" 1.3~exp2
+ (c++)"std::basic_ostream<char, std::char_traits<char> >& std::operator<< <char, std::char_traits<char> >(std::basic_ostream<char, std::char_traits<char> >&, std::_Put_time<char>)@APTPKG_5.0" 1.3~exp2
+ (c++)"std::ctype<char>::do_narrow(char, char) const@APTPKG_5.0" 1.3~exp2