Code signing suddenly fails on Travis CI for the xcode7.3 image. It still works for 6.

There had been no changes I am ware of to our Travis build when this started failing.

This is the error message:

 
2 identities imported.
 
Policy: Code Signing
Matching identities
1) 55796721726649CD18B56506489C319937D74B61 "Developer ID Application: MetaBrainz Foundation Inc. (8D89TSJ88H)"
1 identities found
 
Valid identities only
1) 55796721726649CD18B56506489C319937D74B61 "Developer ID Application: MetaBrainz Foundation Inc. (8D89TSJ88H)"
1 valid identities found
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/codesign_allocate: object: /Users/travis/build/metabrainz/picard/dist/MusicBrainz Picard.app/Contents/MacOS/PyQt5/sip.so malformed object (unknown load command 7)
MusicBrainz Picard.app: the codesign_allocate helper tool cannot be found or used
In subcomponent: /Users/travis/build/metabrainz/picard/dist/MusicBrainz Picard.app/Contents/MacOS/PyQt5/sip.so
The command "if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then bash scripts/package-osx.sh; fi" failed and exited with 1 during .