Revert "update extensions"

This reverts commit a809efee62024b2e2927db193570c9c544ca850b.
Revert "change test bundle wrapper extension from octest to xctest"

This reverts commit 3672975fead8bc186e99efd9fcf6d2628e416249.
Revert "convince Tests iOS target that it's really for iOS"

This reverts commit e31c92ca6e8689f6c0ef46f5dac5f03552b4d444.