Make 1987/lievaart slightly more like original

Restored the #define D define even though it can't be used with modern
compilers, just so it looks as close to the original as possible. This
goes for both versions, the one with the board and the entry (limited by
the contest restrictions).

1987/lievaart/lievaart.c

@@ -1,3 +1,4 @@
+#define D define
 #define Y return
 #define R for
 #define e while

1987/lievaart/lievaart2.c

@@ -1,3 +1,4 @@
+#define D define
 #define Y return
 #define R for
 #define e while

thanks-for-fixes.md

@@ -283,6 +283,12 @@ of `strings.h` and because it's identical in use to `strchr(3)` (and we noted
 that for System V we had to do this) Cody added to the Makefile
 `-Dindex=strchr`.
 
+## [1987/lievaart](1987/lievaart/lievaart.c) ([README.md](1987/lievaart/README.md))
+
+Cody made this ever so slightly like the original code by adding back the
+`#define D define` even though it's unused. This was done for both versions as
+well (the one with the board and the one without, the entry itself with the
+limitations of the contest).
 
 ## [1987/wall](1987/wall/wall.c) ([README.md](1987/wall/README.md]))