`const CObList` and `const CPtrList` still return a value from `GetHead`, `GetTail` and `GetAt`. MSVC 14.2 didn't complain about it, but 14.3 does so.
```
1>D:\boost\range\detail\microsoft.hpp(626,33): error C2440: 'return': cannot convert from 'const void *' to 'const void *&'
1>D:\boost\range\detail\microsoft.hpp(624,1): message : while compiling class template member function 'const void *&boost::range_detail_microsoft::list_iterator<const X,const void *,boost::use_default,boost::use_default>::dereference(void) const'
1> with
1> [
1> X=CPtrList
1> ]
1>D:\boost\iterator\iterator_facade.hpp(631,11): message : see reference to function template instantiation 'const void *&boost::range_detail_microsoft::list_iterator<const X,const void *,boost::use_default,boost::use_default>::dereference(void) const' being compiled
1> with
1> [
1> X=CPtrList
1> ]
1>D:\boost\range\mfc.hpp(881,1): message : see reference to class template instantiation 'boost::range_detail_microsoft::list_iterator<const X,const void *,boost::use_default,boost::use_default>' being compiled
1> with
1> [
1> X=CPtrList
1> ]
```
