d.leg.thin in GRASS 4.0

For those of you running GRASS 4.0 who downloaded d.leg.thin, I
only compiled & tested it in GRASS 4.1.

To compile it in GRASS 4.0, change the following line in main.c

opt2->options = D_color_list();

to this:

opt2->options = "red,orange,yellow,green,blue,indigo,violet,brown,gray,white,black";

D_color_list is a convenience function that currently returns the above
string. I know the program will compile OK with gmake4.0 using the above
substitution, but I can't test it because we aren't running 4.0 anymore.

Bill