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Most macOS builds are of the form major-minor-build, such as 19D76. In
some cases, packaging errors are fixed by repackaging an existing build.
In those cases, the build gets a packaging version, such as 19E258a
(packaging version 2), or 19E234g (packaging version 8).

This CL updates the parsing code to account for the package version.

Bug: 1049832
Test: gn gen with enable_nacl={on,off} on macOS 19D76.
Change-Id: I3aac7ee56acc46a77b7a7a8ea5b19ea386c5d84d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2096912
Auto-Submit: Victor Costan <pwnall@chromium.org>
Commit-Queue: Nico Weber <thakis@chromium.org>
Reviewed-by: Nico Weber <thakis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#748984}