replace space with underscore in getdeps triple
replace space with underscore in getdeps triple

Summary: I don't think the spaces were breaking anything, but many years on unix means they set my spidey sense tingling when looking at the build logs.

Reviewed By: StanislavGlebik

Differential Revision: D32619583

fbshipit-source-id: 8d5bc35f085faced20457645f1c1430371a3c578

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