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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// stdafx.h : include file for standard system include files,

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// or project specific include files that are used frequently, but

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// are changed infrequently

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//

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#pragma once

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#include "targetver.h"

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#define WIN32_LEAN_AND_MEAN             // Exclude rarely-used stuff from Windows headers

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// Windows Header Files:

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#include <windows.h>

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//#include "co_can.h"

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#include "public.h"

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#include "can_driver.h"

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#include "co_can_cinterface.h"

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// TODO: reference additional headers your program requires here