add rpms for double-conversion
add rpms for double-conversion

Summary: Add the system dependencies so getdeps can install them if not present

Reviewed By: krallin

Differential Revision: D32152976

fbshipit-source-id: 29311f37126e1eac8dfbe2f46f6bc3516848d48b

facebook/folly,facebook/folly,facebook/folly,facebook/folly,facebook/folly