dnethack compilation tips.md

These are the things necessary to compile dNAO, with branch devel-3.15.2:

Before you do this, comment out the line of:

# define MENU_COLOR_REGEX

in include/config.h. Then do the following:

1. In include/color.h, change line 64 (struct re_pattern_buffer match;) to char *match.
2. In include/system.h, comment out lines 479-480.
3. In src/options.c, comment out most of lines 1388 and 4189 and set errnum = 0;.
4. In include/decl.h, change lines 597 and 652 to char *match;.
5. In src/pline.c, change line 37 to errnum = 0;.