Calling the function "globpath()" is complex when one is trying to
support multiple versions of Vim because this particular function
developed rapidly (as did "glob()") during the life of Vim 7.0.
This commit makes the version check for calling "globpath()" much
clearer. It also allows for rendering dead links in the NERDTree by
changing the "globpath()" call for versions of Vim that include
patch 7.4.654. This can be done later when the effects are known and
the feature is officially requested.
Fixes#718.
2b2b35ceda