[native_toolchain_c] Add CBuilder.dynamicallyLinkTo option

[blaugold]

Fixes #1419

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[dcharkes]

Are these strings names or file paths? Please document. Also, why prefer names over paths or vice versa? (Should probably be documented in the PR description as design choice.)

[dcharkes]

Users might output their libs somewhere else (a subdir for example), so maybe it's better to have List<Uri> libraries and be explicit about file paths.

If we go for file paths, then we might need to look up the name of the library for macOS/iOS/Linux/Android, unless the compiler allows file paths as well (as opposed to directory and library name.) But for those ditto, if the user compiles dylibs into a subdirectory of the target dir, the linking fails.

[github-actions]

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