b1fa42d81e612adea819f2e9103b6bb1f0d6c07d
This makes the GN build pass the target Fuchsia API level to fidlc. Currently it relies on the default of HEAD, meaning all FIDL changes are immediately visible when the SDK rolls. This was never the intention: flutter should be targeting a specific API level. This unblocks https://fxrev.dev/864297 which makes the fidlc --available flag required, and which uncovered this problem. I also copied the changes to gen_response_file.py from https://fxrev.dev/865020 to make it forward --available to fidlc.
Description
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