upstream SuiteSparse winclang patch

[StefanKarpinski]

https://github.com/JuliaLang/julia/blob/master/deps/patches/SuiteSparse-winclang.patch

Should be upstreamed here: https://github.com/DrTimothyAldenDavis/SuiteSparse

[ViralBShah]

@vtjnash @Keno Do we still need this winclang patch? We are not carrying it on Yggdrasil, and there haven't been any complaints.

[vtjnash]

We don’t build with clang (which is what this patch apparently was for)

[ViralBShah]

While we do not apply it in Yggdrasil, we are still applying it in deps: https://github.com/JuliaLang/julia/blob/6f71de4193717f9267e98b4188aa6e4547146375/deps/suitesparse.mk#L45

Should we remove it?