Fix CSDP segfaults

[blegat]

Reenable tests failing because of the CSDP segfaults: jump-dev/CSDP.jl#39 as it was fixed in jump-dev/CSDP.jl#48

[coveralls]

Coverage decreased (-3.9%) to 50.559% when pulling 897d706 on bl/segfault into 5af773e on master.

[coveralls]

Coverage decreased (-3.9%) to 50.559% when pulling d38bbd8 on bl/segfault into 5af773e on master.

[codecov]

Codecov Report

Merging #11 into master will increase coverage by 0.04%.
The diff coverage is 100%.

@@            Coverage Diff            @@
##           master     #11      +/-   ##
=========================================
+ Coverage   54.46%   54.5%   +0.04%     
=========================================
  Files          20      20              
  Lines        1008    1009       +1     
=========================================
+ Hits          549     550       +1     
  Misses        459     459

Impacted Files	Coverage Δ
src/invariant.jl	66.05% <100%> (+0.31%)	⬆️

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