subprocess: disable -Wclobbered around spawnInternal()
Summary: When compiling with optimization enabled, gcc 7.2 complains about the `childDir` variable potentially being clobbered by the child process after `vfork()`. This shouldn't matter since `childDir` is only used in the child process, and not in the parent after the `vfork()`. Reviewed By: yfeldblum Differential Revision: D7035993 fbshipit-source-id: c80a4e18ad4f629a3d08e310cfd4500ebaf70994
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