Improve how to reconfigure coords in 2014/deak

The Makefile now has variables so that one can do something like

    make X1=-1 Y2=-1 clobber alt

or whatever, with the variables X1, X2, Y1 and Y2 set to what the author
originally had it as.

The alt code still has #ifndef..#endif so that one can (if they want to
be silly) compile it without make(1).

2014/deak/Makefile

@@ -137,6 +137,16 @@ ${PROG}: ${PROG}.c
 alt: data ${ALT_TARGET}
 	@${TRUE}
 
+# Variables to redefine the coordinates in the alt version
+#
+X1= -2
+X2= 1
+Y1= -1.3
+Y2= 1.3
+
+${PROG}.alt: ${PROG}.alt.c
+	${CC} ${CFLAGS} -DX1=${X1} -DX2=${X2} -DY1=${Y1} -DY2=${Y2} $< -o $@ ${LDFLAGS}
+ 
 # data files
 #
 data: ${DATA}