ecflow@5.11.4 also does not build with gcc@9.4.0

[climbfuji]

Describe the bug
Container build of ecflow@5.11.4 with gcc@9.4.0 fails in the same way as it did for the Intel Classic compilers (see #1001):

#17 4758.7   >> 1129    /tmp/root/spack-stage/spack-stage-ecflow-5.11.4-btgdenffmmx7bi7odm
#17 4758.7              bl2xnq2ojwfvpf/spack-src/Base/src/cts/CtsApi.cpp:834:13: error: 'a
#17 4758.7              ssert' was not declared in this scope

To Reproduce
Build ubuntu-gcc-openmpi container with jedi-ci specs in CI using branch feature/discover_scu17.

Also in CI for clang: https://github.com/JCSDA/spack-stack/actions/runs/7990666964/job/21819977664

Expected behavior
It builds!

System:
See above

Additional context
n/a