Otherwise, a call to, for example, nix-prefetch-git, in a nix-shell --pure or
nix-build phase would result in an error such as:
Switched to a new branch 'fetchgit'
removing `.git'...
/nix/store/7qvjji7kbd033nsyxlpiiiam61a44yz9-nix-prefetch-git/bin/.nix-prefetch-git-wrapped: line 374: nix-hash: command not found
allowGoReference was only checked for disallowedReferences definition,
but the fixup of all output binaries removing references to the compiler
did not take this setting into account.
Some npm packages strictly require a specific npm version because npm
don't handle some version requirements the same way in 1.0 and 2.0.
However, Nix don't use npm for dependency resolution (this is always
achieved with npm 1.0 criteria by npm2nix), so these requirements turns
out to be pointless and just crashes some package installations.
This patch removes npm requirements so the packages can still be built.
This solves #5787.
Valérian Galliat