Request to relicense hash gnulib module to LGPLv2+

[Richard W.M. Jones]

libguestfs (an LGPLv2+ library) uses the 'hash' module, which turns
out to be "GPL".

Actually this happened because we started to use it in a separate
GPL'd utility program, but later on included this functionality in the
core library, copying the same code from the utility but not checking
the license of 'hash'.

We'd therefore like to request that 'hash' is relicensed as LGPLv2+.
If this is not possible, we will have to rewrite the code, probably
implementing our own hash table, which would be a shame because hash
works well for our needs.

Notes:

- the code doesn't appear to call exit (it does call abort), and so
  seems to be suitable for a library

- hash-pjw which we also use is already licensed as LGPLv2+

- it looks like the original author was Jim Meyering (CC'd)

- the dependencies are all LGPLv2+

Rich.

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