[cc65] Atari Text Colors

Hi,

I just noticed that on the Atari textcolor() is a dummy. Some remarks
from my side:

1. It would be nice, if the Atari documentation section would provide
a hint on that limitation - i.e. like I did for the Apple II:
http://www.cc65.org/doc/apple2-8.html#ss8.3

2. In atari.h there is:
/* Note that the conio color implementation is monochrome (bgcolor and
textcolor are only placeholders) */

This statement doesn't seem quite right as bgcolor() seems to have
both code and an effect.

3. In apple2.h there is:
/* The following #defines will cause the matching functions calls in conio.h
 * to be overlaid by macros with the same names, saving the function call
 * overhead.
 */
#define _textcolor(color)       COLOR_WHITE
#define _bgcolor(color)         COLOR_BLACK
#define _bordercolor(color)     COLOR_BLACK

This saves quite some bytes when porting "colorful" CBM-biased coding
to the Apple II as all call sites are removed. I pretty sure the Atari
would benefit from doing something similiar for textcolor() -
especially as the default linker config offers relatively little
memory!

Regards,
Oliver
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