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Looks like the above repository was community-developed, in advance of official support from MXCHIP. The last commit to that repository was on Nov 12 2015, and e.g. references v3.3.1 of the WICED SDK.
The official (?) MXCHIP repository is at GitHub - MXCHIP/MXCHIP-for-WICED: Broadcom WICED patchs for MXCHIP wireless platform. , the most recent commit was yesterday (i.e. Nov 2017), and supports v5+ of the WICED SDK.