Static link libstdc++ to improve library compatibility on other Linux versions (fixes #28).

[kirkrodrigues]

References

28

Description

v0.3.2 couldn't run on Debian 8 because (as the issue identifies) the installed version doesn't support the required CXXABI version.

This PR simply static links libstdc++.

Validation performed

• Built the JAR (& library) on Ubuntu Focal
• Installed it in Debian 8
• Verified that programs that use clp-ffi could run on Debian 8