Switching C/C++ compilers

[zmughal]

• https://community.oracle.com/thread/4018588
• https://github.com/nemequ/icc-travis
• https://github.com/nemequ/pgi-travis
• https://bugs.ruby-lang.org/issues/16234
• https://github.com/PDLPorters/devops/issues/1

[devran9]

Hello