Dependencies need auditing

[me-and]

Building Git using Cygport generates setup.hint files that list the various packages' dependencies. For the most part these dependencies are either autogenerated by Cygport, have been listed in the git.cygport file since I inherited it, or have been added to the git.cygport file without particularly thinking about why or whether they're necessary.

I should go through the generated setup.hint files and check all the dependencies are actually sensible.