Include $extra_ldflags in link descriptions.
Include $extra_ldflags in link descriptions.

I overlooked this this morning.  Not hugely important, but nice to see.

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2303933002

Review-Url: https://codereview.chromium.org/2303933002

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