Multi-GCC BinaryBuilder Binary Dependencies for Julia v0.7-v1.0

[juan-pablo-vielma]

Provides binaries with new multi-gcc BinaryProvider that should work with official julia binaries and custom source-builds. In particular, fixes #85, fixes #56, fixes #48, and fixes #30.

To avoid future issues like #56 (and jump-dev/SCS.jl#107 (comment)) the binaries are self contained:

• all dependencies are statically linked (except system libraries like libgfortran)
• coin-blas and coin-lapack are used instead of Julia provider versions as Arch ships a non-standard build that links to the system's openblas and BP cannot yet deal with this (BB try 2 SCS.jl#107 (comment)).
• only Cbc symbols are exported (symbols from dependencies like coin-lapack and coin-osi are not exported)

using the separate dynamic libraries for dependencies would not provide an advantage until there is Pkg3 support for binary dependencies (right now each COIN solver would download its own copy of each dependency, which could cause unexpected symbol clashes if the solvers are independently updated).

Also, this provides a multi-threaded version of Cbc thanks to a last minute catch by @ianfiske

[odow]

32 bit failure is likely jump-dev/MathOptInterface.jl#612

[blegat]

I tested on Arch Linux and it works 🎉