Gradle build on Windows requires admin privilege

[Athosvk]

It seems that when attempting to build with gradle on Windows, the creation of a symlink can fail due to lack of privilege.

[2/3] Build rust `[...]`
[3/3] Create apk
Error: A required privilege is not held by the client. (os error 1314)

(Note that these errors are quite hard to find, it would probably help to annote a lot of the system calls with context)

It turns out the culprit is this line in gradle\mod.rs, when packaging the specified assets from the manifest:

std::os::windows::fs::symlink_dir(&path, &target)?;

As noted in the docs, dir symlinks require admin privilege., but it's not clear that xbuild requires admin rights for running. If it's not desired to have xbuild run as admin (which I assume it isn't), maybe there should be a fallback for if sym link creation fails?

[MarijnS95]

Notice that this code is not available in this repo, but only on a preliminary test-commit of mine on our fork: Traverse-Research@d5ebb6e

Perhaps this isn't the right place to report this.

[MarijnS95]

I did however move it out to a PR in #146, which is where we should handle this as review?

[MarijnS95]

Closing to move into #146.