Log Message:
ico: update to 1.0.6.

Alan Coopersmith (9):
      Update README for gitlab migration
      Update configure.ac bug URL for gitlab migration
      gitlab CI: add a basic build test
      Build xz tarballs instead of bzip2
      man page: remove out-of-date COPYRIGHT section
      Apply scope reduction suggestions from cppcheck
      Rename global "poly" to fix gcc -Wshadow warnings
      Add cast to clear -Wsign-compare warning
      ico 1.0.6