fwver warning fix

[Jonathan]

Whilst  looking for some somewhat-easy things to fix/clean up, I saw 
(with the help of compiler warnings) that the fwver source doesn't 
include unistd.h, which prototypes the sleep() function used by the program.

It's a rather simple patch, and if somehow I screwed it up I think I'll 
become the laughing stock of the mailing list. If not, there's one less 
error in the build process. :D

...I really hope I didn't mess this one up.
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