Bug#743876: non-c99

[Pietro Battiston <me@pietrobattiston.it>]

Julian, sorry for not noticing this mail before.

The honest answer is: I was able to package llvmmath because it builds
(almost) fine by following the usual procedure, not because I understand
how anything works (and that's clearly part of the reason why I don't
really intend to adopt this package).

I may find the time to dig into the code following your suggestion...
but this is not really high priority in my TODO list, mainly because I
would have to learn a lot first, and my usage of numba is quite
sporadic.

Pietro