Change internal macros so they don't warn about unused value

Author: eregon

lib/cext/include/internal.h

@@ -4,8 +4,8 @@
 #define LIKELY(x)             RB_LIKELY(x)
 #define UNLIKELY(x)           RB_UNLIKELY(x)
 
-#define RHASH_ST_TABLE(hash)  (hash, false)
-#define RHASH_TBL_RAW(hash)   (hash, false)
+#define RHASH_ST_TABLE(hash)  (hash)
+#define RHASH_TBL_RAW(hash)   (hash)
 
 #define STR_EMBED_P(str)      (str, false)
 #define STR_SHARED_P(str)     (str, false)