(split) Add preliminary support for the Realtek RTL8188EUS and RTL8188ETV chipsets.

Committed over the TP-LINK TL-WN725N v2 (RTL8188EUS) on amd64 with WPA.
(split) Use logical rather than bitwise OR in if() expression.
(split) Merge branch 'CURRENT' (commit 'e75a4a90')