Disable imath in CI with old compiler
A bad combination of updating some versions (!629 (merged)) and adding a new job (!627 (merged)) leads to some failure of this last one.
Topic-rename: imath-gcc-4.8-support
Edited by Ben Boeckel
A bad combination of updating some versions (!629 (merged)) and adding a new job (!627 (merged)) leads to some failure of this last one.
Topic-rename: imath-gcc-4.8-support