`InstallGitLFS.install()` should support alternate URLs for `git-lfs` GitHub release asset URL
<rdar://problem/101002204>
Pull request: https://github.com/WebKit/WebKit/pull/5210
Committed 255413@main (3c70a091d1fb): <https://commits.webkit.org/255413@main> Reviewed commits have been landed. Closing PR #5210 and removing active labels.
Committed 252432.587@safari-7614-branch (428ade8d253b): <https://commits.webkit.org/252432.587@safari-7614-branch> Reviewed commits have been landed. Closing PR #139 and removing active labels.