This can otherwise fail if the package was only built for some
architectures so far, but not for the architecture that is being generated.
E.g. right now musl-1.2.5-r6 was built already for x86_64 but not aarch64,
which causes errors like the following when running "pmbootstrap aportgen
musl-x86_64" on aarch64:
>>> musl-x86_64: Fetching musl-1.2.5-r5-x86_64-edge.apk::http://dl-4.alpinelinux.org/alpine//edge/main/x86_64/musl-1.2.5-r5.apkConnecting to dl-4.alpinelinux.org (147.75.40.42:80)Connecting to dl-4.alpinelinux.org (147.75.40.42:443)wget: server returned error: HTTP/1.1 404 Not Found>>> ERROR: musl-x86_64: checksum failed
