[cc65] include file search path

If I compile the file simplemenu/menu.c, which #includes the file
"menu.h", the include file is not found. I'm not sure what the
standards say, but gcc handles this by searching in the subdirectory
before searching in the current directory. And yes, I'm too lazy to
add -Isimplemenu in the Makefile :P

-- 
    ___          .     .  .         .       . +  .         .      o   
  _|___|_   +   .  +     .     +         .  Per Olofsson, arkadspelare
    o-o    .      .     .   o         +          MagerValp@cling.gu.se
     -       +            +    .     http://www.cling.gu.se/~cl3polof/
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