Changed makefile to work correctly.

lib/pdftw.h: added old sources fix

ir/cdialect.h:  Added RS6K and RT fix from old wais sources.

ir/ir.c & ir/irretrvl.c: added macro to fix (I think)
                         S_ISDIR problem.

irretrvl.c :    sigh. Rather dumb hack added to make temporary names
                work. Hope it does.


source.c :   added #include source.c (why wasn't this here already???)
             whoops, that isn't the problem. The problem was
		getenv, which was not prototyped.
		...and also strchr; I included 


document.c :  added typing  CRetDocument (line 485)

screen-ui.c : added #include string.h to deal with strrchr()