Add 1988/spinellis/spinellis.alt.c for clang

This was fun to do even though it's also a very simple one liner plus
special handling in the Makefile (the latter part is so you can use it
the exact same way as the original). The original code just #included
/dev/tty. This does something just as magical! It can be used like:

	make alt
	# some C code
	^D
	./spinellis

For instance:

	make alt
	#include <stdio.h>
	int main() { puts("hello world"); }
	^D
	./spinellis

Now those with clang can enjoy the entry without any functional
difference.

I have a very twisted point to make about the original version and this
version too: with a very slight change one can actually make a C++
version. Ick! :-)

1988/spinellis/Makefile

@@ -111,8 +111,8 @@ OBJ= ${PROG}.o
 DATA= spinellis.data
 TARGET= ${PROG}
 #
-ALT_OBJ=
-ALT_TARGET=
+ALT_OBJ= ${PROG}.alt.o
+ALT_TARGET= ${PROG}.alt
 
 
 #################
@@ -135,6 +135,10 @@ ${PROG}: ${PROG}.c
 alt: data ${ALT_TARGET}
 	@${TRUE}
 
+${PROG}.alt: ${PROG}.alt.c
+	${CC} ${CFLAGS} -Wno-implicit-function-declaration $< -o $@ ${LIBS}
+	@while read -r r; do echo $$r ; done | ./${PROG}.alt
+
 # data files
 #
 data: ${DATA}