Eliminate redundant gnulib versions, if possible

[Googulator]

Right now, we use 13 different versions of gnulib, each as a dependency of only one package. It would be great if these could be unified, or at least some of them.

[fosslinux]

This will be fairly tedious. gnulib works under a rolling release model, and has a bit of a "move fast break things" philosophy it seems.

My suggested strategy in doing this would be;

• bisect moving forward and backward to find a range of versions working for each package using gnulib
• find overlapping regions to remove gnulib versions