Move some more defines to format_constants.h

Also remove some duplicate const/defines.

Change-Id: I0ec48866b874f546022d72e938fb65669b0b3211

src/webp/format_constants.h

@@ -29,11 +29,14 @@
 #define MAX_CACHE_BITS               11
 #define HUFFMAN_CODES_PER_META_CODE  5
 #define ARGB_BLACK                   0xff000000
+
 #define DEFAULT_CODE_LENGTH          8
+#define MAX_ALLOWED_CODE_LENGTH      15
 
 #define NUM_LITERAL_CODES            256
 #define NUM_LENGTH_CODES             24
 #define NUM_DISTANCE_CODES           40
+#define CODE_LENGTH_CODES            19
 
 #define TRANSFORM_PRESENT            1  // The bit to be written when next data
                                         // to be read is a transform.