message: CI: use newer GCC (on Ubuntu)
diff: @@ -93,14 +93,14 @@ centos6-icc-package:
  extends: [ .centos6, .linux-package ]
  dependencies: [ centos6-icc-check-symbols ]
  -centos6-gcc-build:
  - extends: [ .centos6, .linux-gcc-build ]
  -
  # ---------------------------------------------------------------------------
  .ubuntu18.04:
  image: openimagedenoise/build:ubuntu18.04
  +ubuntu18.04-gcc-build:
  + extends: [ .ubuntu18.04, .linux-gcc-build ]
  +
  ubuntu18.04-clang-build:
  extends: [ .ubuntu18.04, .linux-clang-build ]
  