Pull dSFMT from conda-forge

[dfornika]

I've opened conda-forge/staged-recipes#3965 to add dSFMT to conda-forge.

We'll need to take a look at a few files in the julia repo to match their build:

https://github.com/JuliaLang/julia/blob/master/deps/dsfmt.mk
https://github.com/JuliaLang/julia/blob/master/deps/libdSFMT.def
https://github.com/JuliaLang/julia/blob/master/deps/patches/dSFMT.h.patch
https://github.com/JuliaLang/julia/blob/master/deps/patches/dSFMT.c.patch

[jakirkham]

We now have this packaged. The patch point is raised as issue ( conda-forge/dsfmt-feedstock#1 ).

[ngam]

@mkitti any opinions on this? should we look into it?