InvokeArgument doesn't work with boost::function on GTest 1.10

Trying to compile code using` InvokeArgument<>` that points to `boost::function` fails with error:

> boost_1_73_0/boost/function/function_template.hpp:1086:16: error: use of deleted function ‘constexpr std::tuple< >::tuple(const std::tuple< >&) [with _Elements = {boost::function&&}]’ base_type(f)

I've managed to reproduce this error using boost 1.73, gcc 6.3 and 9.3, with GTest 1.10 and sources from master.
Error does not occur on GTest 1.8 and earlier, my investigation shows that commit [9494c45](https://github.com/google/googletest/commit/9494c45e75a55547f3f183a1161fbd39d29b994e) is responsible for the problem.

Reproduction:
```
#include
#include
#include

class M{
public:
MOCK_METHOD1(f, void(boost::function));
};

TEST(A,B){
M m;
ON_CALL(m, f(::testing::_))
.WillByDefault(::testing::InvokeArgument<0>());
}

int main(){
return 0;
}
```