Make 1987/heckbert examples work

That is the examples have been changed to not break. See the README.md
file for details (including some fun details).

1987/heckbert/.gitignore

@@ -1,4 +1,7 @@
+bar
 bar.c
+foo
+foo.c
 heckbert
 ph
 ph.c

1987/heckbert/Makefile

@@ -179,21 +179,13 @@ ALT_TARGET= ${PROG}.orig
 all: ${DATA} ${TARGET}
 	@${TRUE}
 
-.PHONY: alt data everything clean clobber nuke dist_clean \
+.PHONY: data everything clean clobber nuke dist_clean \
 	install build love haste waste make easter_egg \
 	supernova deep_magic magic charon pluto
 
 ${PROG}: ${PROG}.c
 	${CC} ${CFLAGS} $< -o $@ ${LIBS}
 
-# alternative executable
-#
-alt: ${DATA} ${ALT_TARGET}
-	@${TRUE}
-
-${PROG}.orig: ${PROG}.orig.c
-	@echo "NOTE: The original source may not compile using modern compilers."
-	${CC} ${CFLAGS} $< -o $@ ${LIBS}
 
 # data files
 #

1987/heckbert/README.md

@@ -7,23 +7,39 @@ Pixar
 
         make all
 
-NOTE: The original entry may be built with "make alt".
+
+On System V systems, we had to compile with `-Dindex=strchr`.
+To compile on a 16 bit machine, change 300000 to 30000.
+
 
 ## Judges' comments:
 
-
 ### Try:
-	ph 40 < ph.c > foo.c; cc foo.c -o ph
-	ph 20 < a_C_prog.c > bar.c; cc bar.c
+
+	./heckbert 40 < heckbert.c > ph.c; make ph
+	./ph 21 < heckbert.c > bar.c; make bar
+	# or more generally fold some other file at a positive column:
+	./ph col < file
+
+Ask yourself what happens to `foo.md` if you try:
+
+	./ph 40 < README.md > foo.md
+
+Folding at the wrong length may be equivalent to a "Spindle or Mutilate" operation.  For example:
+
+	./heckbert 40 < heckbert.c > ph.c ; make ph ; ./ph 20 < heckbert.c > bar.c ; make bar
+
+
+Try not to
+[Fold, Spindle or Mutilate](https://repository.library.brown.edu/studio/item/bdr:788264/PDF/)
+files.  :-)
+
 
 The judges used this program to fold up very long lines which the
 BSD fold(1) was unable to process.  This program has been added
 to the contest tool chest.
 
-On System V systems, compile with: `-Dindex=strchr`
-To compile on a 16 bit machine, change 300000's to 30000.
 
-NOTE: This entry requires a non-standard K&R C compiler to compile.
 
 Copyright (c) 1987, Landon Curt Noll & Larry Bassel.
 All Rights Reserved.  Permission for personal, educational or non-profit use is

1987/heckbert/heckbert.orig.c

@@ -1,18 +0,0 @@
-#include <ctype.h>
-#include <stdio.h>
-#define _ define
-#_ A putchar
-#_ B return
-#_ C index
-char*r,c[300001],*d=">=<=!===||&&->++-->><<",*i,*l,*j,*m,*k,*n,*h,*y;e,u=1,v,w,
-f=1,p,s,x;main(a,b)char**b;{p=a>1?atoi(b[1]):79;r=c+read(0,j=l=i=c,300000);v=g(
-j,&m);for(k=m;v!=2;j=k,m=n,v=w,k=m){w=g(k,&n);if(v==1&&m-j==1&&*j==35)e&&A(10),
-e=f=0;if(!f&&v==3&&(char*)C(j,10)<m)A(10),e=0,f=1;else if(v>2&&(u||w)&&(f||u)&&
-(l-i>1||*i!=61||n-k>1||!C("-*&",*k)))continue;else if(v==3)if(f&&e+1+n-k>p&&e)A
-(10),e=0;else A(32),e++;else{if(f&&e+m-j>p&&e)A(10),e=0;e+=m-j;k=j;while(k<m)A(
-*k++);}i=j;l=m;u=v;}e&&A(10);}g(j,m)char*j,**m;{if(j>=r)B*m=j,2;s=isdigit(*j)||
-*j==46&&isdigit(j[1]);for(h=j;h<r;h++)if(!isalnum(*h)&&*h!=95&&(!s||*h!=46)&&(!
-s||h[-1]!=101&&h[-1]!=69||!C("+-",*h)))break;if(h>j)B*m=h,0;x=1;for(h=j;h<r&&C(
-" \t\n",*h);h++);if(h>j)h--,x=3;if(*j==34||*j==39)for(h=j+1;h<r&&*h!=*j;h++)if(
-*h==92)h++;for(y=d;*y&&strncmp(y,j,2);y+=2);if(*y)h=j+1;if(!strncmp("/*",j,2)){
-h=j+2;while(*++h!=42||*++h!=47);x=4;}*m=h+1;B x;}