adjust gnu download paths

Some projects download from gnu mirrors, however the project.mk adds an extra /gnu thus causing a 404. The following patch removes all extra /gnu from packages using the BR2_GNU_MIRROR to define the project site variable.

On a side note, it has been a few years since I was actively involved in providing patches for buildroot, however I have another project coming up here where I expect to use buildroot quite a bit. How do I go about getting svn access for bugs/patches like this?

Nathanael D. Noblet
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