#1113955 autopkgtest: allows invalid architecture syntax

#1113955#5
Date:
2025-09-04 17:12:55 UTC
From:
To:
Architecture: [!armhf]
seen in boost1.83 and boost1.88

Architecture: [!s390x]
seen in csound and pd-midifile

The invalid syntax causes the marked tests to be skipped on all
architectures, so appears to work as intended.