Support embrace-io/embrace-apple-sdk.

[cgrindel]

Related Slack thread.

There are two issues:

1. The EmbraceObjCUtilsInternal module has two module map files. The existing rules_swift_package_manager code treats this as an error. The fix is to warn the client and just use the first one that is found.
2. The GRDB.swift package, a transitive dependency, defines a systemLibrary target. rules_swift_package_manager does not yet support these target types.

[adincebic]

@cgrindel what does it take to support packages with system library targets? Is the change complex?

[cgrindel]

what does it take to support packages with system library targets? Is the change complex?

Probably not. I have not dug into it. I would look at how SPM builds targets linked to these libraries. There is a flag which tells SPM to output its build commands. Then, it is a matter of generating the appropriate targets here.

[luispadron]

Related to #248

[adincebic]

I'll have some time next weekend to attend this issue. Thank you both for references.

[lucasmarcal-faire]

SystemLibrary Support Draft PR: #1323

[luispadron]

Duplicate of #248, thanks for working on this @lucasmarcal-faire!

edit: ah I see theres two issues tied with this one