Michael Hudson-Doyle reported that ppc64el/artful builds on Launchpad fail because snapcraft incorrectly believes that the core snap is not installed (see e.g. https://launchpadlibrarian.net/340314110/buildlog_snap_ubuntu_artful_ppc64el_subiquity_BUILDING.txt.gz).
This is because the core-dynamic-linker setting on ppc64el (and s390x) has a stray leading slash, so os.path.join('/snap/core/current', '/lib64/ld64.so.2') returns '/lib64/ld64.so.2', so snapcraft tries to resolve the dynamic linker symlink on the host system, and that may point to a file name that doesn't exist in the core snap. The correct fix is to drop the leading slashes, and to put test code in place to ensure that similar mistakes can't accidentally be made for future architectures.
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