[open-beos-printing] Fix: USB/Serial/Parallel Port transport add-ons link error

Hi guy(s?),

Today I discover that 3 of our print transports were wrong. They didn't 
export init_transport() and exit_transport() !
As we were linking them against the static libprinttransportaddon.a but 
without refering these symbols from the addon, the linki process didn't 
include them.

So, I just commit a fix to this issue : we now explicitly link with 
PrintTransportAddOn.o instead.

I've renamed these transport add-ons main source file from 
print_transport.cpp to *Transport.cpp to remove a potential jam names 
conflict. 
And I think these new names make more sense.

Oh my, how I'm bored these days! ;-)

- Philippe 

--
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