Minor updates to 1989 files

Mostly this involves README.md files in some entries but the
1989/robinson/Makefile was updated. Force -include option in CINCLUDE
variable not CDEFINE.

1989/robison/Makefile

@@ -123,7 +123,7 @@ CFLAGS= ${CSTD} ${CWARN} ${ARCH} ${CDEFINE} ${CINCLUDE} ${OPT}
 
 # FORCE use of -include stdlib.h
 #
-CFLAGS+= -include stdlib.h
+CINCLUDE+= -include stdlib.h
 
 
 ## FORCE