Use gcc -ansi -pedantic in 9c.  Fix many non-C89-isms.
diff --git a/src/cmd/tcs/big5.c b/src/cmd/tcs/big5.c
index dda738f..051f1b0 100644
--- a/src/cmd/tcs/big5.c
+++ b/src/cmd/tcs/big5.c
@@ -1747,5 +1747,5 @@
     -1,    -1,    -1,    -1,    -1,    -1,    -1,    -1,
     -1,    -1,    -1,    -1,    -1,    -1,    -1,    -1,
     -1,    -1,    -1,    -1,    -1,    -1,    -1,    -1,
-    -1,    -1,    -1,    -1,    -1,
+    -1,    -1,    -1,    -1,    -1
 };