Fix : libcanfestival_unix.a not built if examples are not compiled

Problem: when building Canfestival with unix timers 'libcanfestiva_unix.a'
is built only if you build examples too.

Test case:

$ ./configure --timers=unix --can=socket --target=unix
$ make canfestival

...

no errors but 'libcanfestival_unix.a' is not built:
$ find . -name "*.a"
./src/libcanfestival.a

Changing line 90 of 'drivers/unix/Makefile.in' to:
#driver: $(OBJS)
driver: libcanfestival_$(TARGET).a

solves the problem:

$ ./configure --timers=unix --can=socket --target=unix
$ make canfestival

...

$ find . -name "*.a"
./drivers/unix/libcanfestival_unix.a
./src/libcanfestival.a

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#ifndef CALLBACK_H_

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#define CALLBACK_H_

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extern "C"

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{

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#include "ObjDict.h"

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}

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void Call_heartbeatError (CO_Data * d, UNS8);

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UNS8 Call_canSend (Message *);

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void Call_initialisation (CO_Data * d);

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void Call_preOperational (CO_Data * d);

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void Call_operational (CO_Data * d);

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void Call_stopped (CO_Data * d);

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void Call_post_sync (CO_Data * d);

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void Call_post_TPDO (CO_Data * d);

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void Call_storeODSubIndex (CO_Data * d, UNS16 wIndex, UNS8 bSubindex);

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#endif /*CALLBACK_H_ */