[bug#38128] [PATCH] gnu: Add boost-with-python3

[goodoldpaul]

Hello Guixers!

Given the recent discussion about dropping python 2 completely I thought 
it's time to build our libboost against python 3. I didn't have the time 
to check if every boost dependency (there are a lot ;) ) supported 
python 3, so I added a new variable "boost-with-python3". I'm not sure 
if I should have made it hidden or if I should have update directly 
boost definition so any feedback is welcome.

Thanks for your patience reviewing this patch,

Giacomo

0001-gnu-Add-boost-with-python3.patch
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