webkitgtk-2.4: drop autoreconf, propagate harfbuzz-icu
webkitgtk-2.4: drop autoreconf, propagate harfbuzz-icu

The autoreconf phase isn't needed anymore but wasn't removed.

Fixes #10099 (I think).
It's maybe slightly wasteful for the closure, but it's likely that
in the case of webkit it won't be a big deal and icu might
be in the closure anyway.

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