Add -include stdio.h to 1987/westley/Makefile

Although this is very unlikely(?) nowadays the judges noted that
putchar() has to exist and if compilation fails one should include
stdio.h. This cannot be done in the file, however, as it would ruin the
symmetry (already some of this was messed up due to C standard changes).

1987/westley/Makefile

@@ -39,7 +39,7 @@ include ../../var.mk
 # Common C compiler warnings to silence
 #
 CSILENCE= -Wno-for-loop-analysis -Wno-unused-value \
-	-Wno-deprecated-non-prototype -Wno-strict-prototypes
+	-Wno-deprecated-non-prototype -Wno-strict-prototypes -Wno-implicit-int
 
 # Common C compiler warning flags
 #
@@ -62,7 +62,7 @@ CDEFINE=
 
 # Include files that are needed to compile
 #
-CINCLUDE=
+CINCLUDE= -include stdio.h
 
 # Optimization
 #