including a new gnulib module

[John W. Eaton]

On 22-Jul-2012, c. wrote:

| Hi,
| I'd like to write a DLD function that uses the base64 and base32 modules from 
OF.
| How do I add these to the list of modules being built when compiling Octave?

The list of gnulib modules is in the file build-aux/bootstrap.conf.
That list should only include the modules we use directly.
Dependencies are supposed to be handled automatically.

jwe