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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// dllmain.cpp : Defines the entry point for the DLL application.

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#include "stdafx.h"

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BOOL APIENTRY DllMain( HMODULE hModule,

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                       DWORD  ul_reason_for_call,

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                       LPVOID lpReserved

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					 )

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{

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	switch (ul_reason_for_call)

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	{

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	case DLL_PROCESS_ATTACH:

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	case DLL_THREAD_ATTACH:

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		break;

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	case DLL_THREAD_DETACH:

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	case DLL_PROCESS_DETACH:

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		break;

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	}

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	return TRUE;

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}

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