Add missing space after = in 1985/shapiro

.. the Makefile, that is.

1985/shapiro/Makefile

@@ -137,7 +137,7 @@ alt: data ${ALT_TARGET}
 	@${TRUE}
 
 # variable to control size of maze for alt code
-SIZE=39
+SIZE= 39
 
 ${PROG}.alt: ${PROG}.alt.c
 	${CC} ${CFLAGS} -DC=${SIZE} $< -o $@ ${LDFLAGS}