🚀 go-pugleaf

I've been porting graphics-0.17 to the RS/6000 and found that it will
not compile correctly using the standard compiler.  It assumes that
characters are unsigned.  For AIX, it is necessary to compile it with
the following flags

cc -qchars=signed

I guess the preferred solution would be for it to compile correctly
with chars signed or unsigned.  Alternatively, an AIX section of the
Makefile could have CFLAGS set appropriately.

Tim.