Add support for RTL8188FTV chip to urtwn(4).

Tested with Comfast CF-WU710N v4.

"go ahead" deraadt@
OK stsp@

Build firmware for rsu(4), rtwn(4), and urtwn(4).
We have to install the files with new filenames (removal of "fw" from each of
the filenames) and change the driver to use the new filenames,
such tha

Build firmware for rsu(4), rtwn(4), and urtwn(4).
We have to install the files with new filenames (removal of "fw" from each of
the filenames) and change the driver to use the new filenames,
such that the package becomes irrelevant.

Discussed with deraadt@ and sthen@

ok deraadt@

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