openbsd: link with required system libraries (#7380)

* openbsd: use -lpthread when linking

and while compiling zig stage2, use c++ and c++abi too
7cd6c25c8fSebastien Marie committed on 12/15/2020, 7:45:48 PM· committed by GitHubparent8a2ab60
2 files changedLine totals unavailable