Silence unused variable warnings

Author: erlend-aasland

Modules/cjkcodecs/cjkcodecs.h

@@ -219,6 +219,7 @@ static int                                                          \
 add_mappings(cjkcodecs_module_state *st)                            \
 {                                                                   \
     int idx = 0;                                                    \
+    (void)idx;                                                      \
     st->num_mappings = NUM;                                         \
     st->mapping_list = PyMem_Calloc(NUM, sizeof(struct dbcs_map));  \
     if (st->mapping_list == NULL) {                                 \
@@ -242,6 +243,7 @@ static int                                                      \
 add_codecs(cjkcodecs_module_state *st)                          \
 {                                                               \
     int idx = 0;                                                \
+    (void)idx;                                                  \
     st->num_codecs = NUM;                                       \
     st->codec_list = PyMem_Calloc(NUM, sizeof(MultibyteCodec)); \
     if (st->codec_list == NULL) {                               \