Fix MSVC6 warnings. (spotted by Tim Peters)
diff --git a/Modules/cjkcodecs/_cp932.c b/Modules/cjkcodecs/_cp932.c
index 0f21b12..870c1c6 100644
--- a/Modules/cjkcodecs/_cp932.c
+++ b/Modules/cjkcodecs/_cp932.c
@@ -20,7 +20,7 @@
         unsigned char    c1, c2;
 
         if (c <= 0x80) {
-            WRITE1(c)
+            WRITE1((unsigned char)c)
             NEXT(1, 1)
             continue;
         } else if (c >= 0xff61 && c <= 0xff9f) {