Build ABI Tests

This is a small repository of tests for ABI.

• tools: tools useful for performing tests
• tests: boiled down reproducers demonstrating subtle ABI breaks
• libabigail: includes tests by @woodard relevant to libabigail.
• exceptions: is a playing area for looking at exceptions.
• examples: includes subfolders of broken ABI issues we've found in the wild.

If you find an example case, please contribute it here, or ask a question.