Clean up unused function warnings in vp8 decoder

Mark functions in dboolhuff.h and treereader.h with INLINE.

Change-Id: Ifc1008de0713c8d43f4fec83a8c2b836622be365

vp8/decoder/dboolhuff.h

@@ -15,7 +15,7 @@
 #include <stddef.h>
 #include <limits.h>
 
-#include "vpx_config.h"
+#include "./vpx_config.h"
 #include "vpx_ports/mem.h"
 #include "vpx/vp8dx.h"
 #include "vpx/vpx_integer.h"
@@ -95,7 +95,7 @@ static int vp8dx_decode_bool(BOOL_DECODER *br, int probability) {
     return bit;
 }
 
-static int vp8_decode_value(BOOL_DECODER *br, int bits)
+static INLINE int vp8_decode_value(BOOL_DECODER *br, int bits)
 {
     int z = 0;
     int bit;
@@ -108,7 +108,7 @@ static int vp8_decode_value(BOOL_DECODER *br, int bits)
     return z;
 }
 
-static int vp8dx_bool_error(BOOL_DECODER *br)
+static INLINE int vp8dx_bool_error(BOOL_DECODER *br)
 {
     /* Check if we have reached the end of the buffer.
      *

vp8/decoder/treereader.h

@@ -12,6 +12,7 @@
 #ifndef VP8_DECODER_TREEREADER_H_
 #define VP8_DECODER_TREEREADER_H_
 
+#include "./vpx_config.h"
 #include "vp8/common/treecoder.h"
 #include "dboolhuff.h"
 
@@ -28,7 +29,7 @@ typedef BOOL_DECODER vp8_reader;
 
 /* Intent of tree data structure is to make decoding trivial. */
 
-static int vp8_treed_read(
+static INLINE int vp8_treed_read(
     vp8_reader *const r,        /* !!! must return a 0 or 1 !!! */
     vp8_tree t,
     const vp8_prob *const p