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FIDL package names consist of multiple dot-delimited segments, to allow
scoping of packages to avoid clashes. Our GN generator script was using
only the final segment of each package's name, resulting in clashes,
e.g. between fuchsia.auth and fuchsia.modular.auth, if both were
present in the SDK.

We continue to generate targets under the //third_party/fuchsia-sdk/sdk
namespace, but use the full name rather than only the final segment,
e.g. custom.modular.auth would become custom_modular_auth.

We also special-case the top-level "fuchsia" namespace to be ignored,
e.g. fuchsia.modular_auth becomes just modular_auth.

Bug: 910670
Change-Id: I675d894c72b5d43b6d8b20fb026075573a5a3380
Reviewed-on: https://chromium-review.googlesource.com/c/1372892
Commit-Queue: Wez <wez@chromium.org>
Reviewed-by: Kevin Marshall <kmarshall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#615763}