DEPS: commented out obviously unneeded dependencies for Linux-only build, ~5GiB in total

[Mis012]

Description of Change

do not needlessly download ~5GiB of data that is not actually needed

API Changes

None.

Behavioral Changes

None.

PR Checklist

• [* ] Rebased on top of skiasharp at time of PR
• [* ] Changes adhere to coding standard
• Updated documentation - https://github.com/mono/SkiaSharp/wiki/Building-on-Linux should be updated

EDIT: it seems these dependencies are in fact needed for a general build.
the pull request now instead adds a new DEPS file in build/linux-self-hosted/DEPS.

if https://github.com/mono/SkiaSharp/wiki/Building-on-Linux is updated to add
cp build/linux-self-hosted/DEPS DEPS before python tools/git-sync-deps, this will
save downloading ~5GiB of unused dependencies

[Mis012]

@dotnet-policy-service agree

[Gillibald]

Why is the emsdk not needed when Skia is build for wasm?

[Mis012]

well, it would be needed in that case, but afaik you are never building it for wasm?
EDIT: hm, guess I missed that line in the list in the README
now these dependencies make more sense

[Mis012]

it seems the git-sync-deps script supports specifying which OS a particular dependency is needed for, so maybe that could be used to avoid 5GiB of dependencies for wasm when following https://github.com/mono/SkiaSharp/wiki/Building-on-Linux, but I don't see how exactly one would do that

[Mis012]

in light of the dependencies being in fact necessary for the general build, I have reduced the scope to only affect the builds done according to https://github.com/mono/SkiaSharp/wiki/Building-on-Linux, which would happen by virtue of a copy command being added to the guide