restore *.orig.c to each entry

Under each yyyy/dir there is a file of the form '*.orig.c'
containing the original source code, or as close as we can
get to the original source code.

2000/tomx/tomx.orig.c

@@ -0,0 +1,22 @@
+#include <stdio.h>
+#define  true
+
+true /*:all
+
+CC=cc
+PROG=tomx
+
+false :
+	make -f $0 $1
+	exit 0
+
+all: $(PROG)
+
+%:%.c
+	$(CC) $< -o $@
+
+clean:
+	rm $(PROG)
+
+.PHONY: /* true clean */
+	int main() {return!printf("Hello, world\n");}