Paket is running commands on git dependencies when paket outdated is called

[cloudRoutine]

Description

Repro steps

Paket Dependencies File

source https://nuget.org/api/v2

git https://github.com/ionide/ionide-vscode-helpers.git master build:"build.cmd", OS: windows
git https://github.com/ionide/FsAutoComplete.git keywords build:"build.cmd LocalRelease", OS: windows
git https://github.com/fsprojects/Forge.git master build:"build.cmd", OS: windows

git https://github.com/ionide/ionide-vscode-helpers.git master build:"build.sh", OS: mono
git https://github.com/ionide/FsAutoComplete.git keywords build:"build.sh LocalRelease", OS: mono
git https://github.com/fsprojects/Forge.git master build:"build.sh", OS: mono

paket outdated

Expected behavior

Checks for a newer hash and reports if there is one

Actual behavior

Checks for a newer hash and starts downloading and running commands

[agross]

paket outdated will also download http dependencies and fail if they're already downloaded:

$ paket outdated --ignore-constraints
Paket version 4.8.5
Downloading dl.google.com/:/closure-compiler/compiler-latest.zip compiler-latest.zip to D:\Users\agross\Projekte\GROSSWEBER\grossweber\web-nanoc4\paket-files\dl.google.com\compiler-latest.zip
Paket failed with:
        The file 'D:\Users\agross\Projekte\GROSSWEBER\grossweber\web-nanoc4\paket-files\dl.google.com\COPYING' already exists.