[GSoC] Doubts in an issue

Greetings Johannes!

I was trying to solve isse #406[1]. I have understood what we are trying to achieve for
the most part, but I still need some confirmation. As far as my understanding goes, here
is what I have inferred(forgive me if I am wrong anywhere):

We had "dashed" versions of present day commands such as <<git add>> in the old times.
Now, whenever we call scripts whose "dashed" version exists, it will sort of link the "dashed"
version as well for I guess historical reasons? ;)

And hence this takes up quite some time to link those built-ins especially in Windows. Therefore,
our aim is to remove that option of linking the "dashed" forms by default.

One thing I don't understand is, where is the <<libexec/git-core/>> directory? And what exactly
do we mean by "built-ins" here(does it refer to the "dashed" commands)?

Thanks, 
Shourya Shukla

[1]: https://github.com/gitgitgadget/git/issues/406