Merge branch 'pu/version-node' of https://github.com/guillemj/liburing into master

* 'pu/version-node' of https://github.com/guillemj/liburing:
  Fold versioned symbols into LIBURING_2.0 version node
  Remove versioned symbols not provided by the shared library anymore
  .gitignore: Add missing test programs
  .gitignore: Sort test program entries