Various configure and build enhancements:
- Auto detect availability of wxWidgets, disable or enable examples build accordingly
- Enhacend (cross) toolchain detection and prefix. Now compile win32 target on linux host (--cc=i686-mingw32-gcc)

#ifndef TESTSLAVEGUI_H_
#define TESTSLAVEGUI_H_

extern "C" 
  {
	#include "canfestival.h"
  }

int 	main_can(s_BOARD SlaveBoard, char* LibraryPath);
void	stop_slave();

#endif /*TESTSLAVEGUI_H_*/