fix(llvmlite): static linking disabled by default

[cameronraysmith]

Static linking https://github.com/numba/llvmlite/issues/93 was disabled by default in

• https://github.com/numba/llvmlite/pull/250
• "-static-libstdc++" is not used in https://github.com/numba/llvmlite/blob/f22420ad768a31dd15ae45d551bb4e73907a27fa/ffi/Makefile.linux

as of Apr 10, 2017

• https://github.com/numba/llvmlite/releases/tag/v0.17.0
• https://pypi.org/project/llvmlite/0.17.0/#files

if not before. For reference, I believe this may have been created here in https://github.com/nix-community/poetry2nix/commit/c0d10a691e6e8d13673de659fb39ef6a1b23a3bd.