Add label field to 'platform' table to show more descriptive content with more flexibility.
<rdar://problem/107119770>
Pull request: https://github.com/WebKit/WebKit/pull/11878
Committed 262091@main (14694378eb0c): <https://commits.webkit.org/262091@main> Reviewed commits have been landed. Closing PR #11878 and removing active labels.