Allow install of binutils and import texinfo

Allow install of binutils and import texinfo

 - Enable installing binutils from the base system.

 - Import texinfo which is required for the binutils tools
   to be compiled.

 - Also adapted the fetch rules to correctly generate the
   gitignore files for gcc, and allow the case of multiple
   modules in the same directory, as found in gnu/dist.

Warning: This patch has an entry in docs/UPDATING

Change-Id: Ib781734e8fd7f9c6265fa65d62ba2cf3fccbc5ba