Only prepare the pre-requisites for the current SDKROOT
Revert "Only prepare the pre-requisites for the current SDKROOT"

This reverts commit 8d3a71cd9d0b83b7de71fca0e7f91dea1d7bf566.
Only prepare the pre-requisites for the current SDKROOT
Merge pull request #904 from antmd/master

Only prepare pre-requisites for the current SDK/platform