Fix missing space after -iframework switch that regressed in 200111@main for Bug 184557.
PR: https://github.com/WebKit/WebKit/pull/10061
<rdar://problem/105420335>
Committed 260229@main (e9bbee0464ff): <https://commits.webkit.org/260229@main> Reviewed commits have been landed. Closing PR #10061 and removing active labels.