bug#28602: Unpack fails with no error message when using a .zip source

[nee]

Hello,

right now unpacking .zip sources only works when unzip is added as
native input. That's all right, but there is no error message, just:

starting phase `unpack'
phase `unpack' failed after 0.0 seconds

It should say something like:

starting phase `unpack'
Archive with .zip suffix failed to unpack. Please add unzip as
native-input to the package, e.g. (native-inputs `(("unzip" ,unzip)))
phase `unpack' failed after 0.0 seconds

I tested this in the cmake-build-system