Add alt code to 1988/dale - original version

This is because I feel it can be interesting to see side by side what
was once allowed in C with how it has to be today without having to
extract it from the archive.

1988/dale/Makefile

@@ -112,8 +112,8 @@ OBJ= ${PROG}.o
 DATA=
 TARGET= ${PROG}
 #
-ALT_OBJ=
-ALT_TARGET=
+ALT_OBJ= ${PROG}.alt.o
+ALT_TARGET= ${PROG}.alt
 
 #################
 # build the entry