Add alt versions to 1991/cdupont

There are three alt versions. One has a comment and an unused goto label
removed that are warned against being removed; another has this done and
is also beautified (which is also warned against) and the third is one
that is just beautified.

This involved changing the 's' macro to be '__FILE__' because otherwise
it would read in the original code and not show the problem.

1991/cdupont/Makefile

@@ -57,7 +57,7 @@ ARCH=
 
 # Defines that are needed to compile
 #
-CDEFINE= -Ds=\"cdupont.c\" -Dt=\"r\"
+CDEFINE= -Ds=__FILE__ -Dt=\"r\"
 
 # Include files that are needed to compile
 #
@@ -111,8 +111,8 @@ OBJ= ${PROG}.o
 DATA=
 TARGET= ${PROG}
 #
-ALT_OBJ=
-ALT_TARGET=
+ALT_OBJ= ${PROG}.alt.o ${PROG}.alt2.o ${PROG}.alt3.o
+ALT_TARGET= ${PROG}.alt ${PROG}.alt2 ${PROG}.alt3
 
 
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