libwebp: update to 0.4.2-rc2

third_party/libwebp/enc/vp8enci.h

Index: third_party/libwebp/enc/vp8enci.h
diff --git a/third_party/libwebp/enc/vp8enci.h b/third_party/libwebp/enc/vp8enci.h
index b5bb87b465f13f2d52fd001399700e468a09221b..10c8fb0a1f201607e8b00ee9e31efc27154249ed 100644
--- a/third_party/libwebp/enc/vp8enci.h
+++ b/third_party/libwebp/enc/vp8enci.h
@@ -30,7 +30,7 @@ extern "C" {
 // version numbers
 #define ENC_MAJ_VERSION 0
 #define ENC_MIN_VERSION 4
-#define ENC_REV_VERSION 1
+#define ENC_REV_VERSION 2
 
 // intra prediction modes
 enum { B_DC_PRED = 0,   // 4x4 modes
@@ -457,10 +457,10 @@ struct VP8Encoder {
   VP8MBInfo* mb_info_;   // contextual macroblock infos (mb_w_ + 1)
   uint8_t*   preds_;     // predictions modes: (4*mb_w+1) * (4*mb_h+1)
   uint32_t*  nz_;        // non-zero bit context: mb_w+1
-  uint8_t   *y_top_;     // top luma samples.
-  uint8_t   *uv_top_;    // top u/v samples.
+  uint8_t*   y_top_;     // top luma samples.
+  uint8_t*   uv_top_;    // top u/v samples.
                          // U and V are packed into 16 bytes (8 U + 8 V)
-  LFStats   *lf_stats_;  // autofilter stats (if NULL, autofilter is off)
+  LFStats*   lf_stats_;  // autofilter stats (if NULL, autofilter is off)
 };
 
 //------------------------------------------------------------------------------
@@ -571,7 +571,7 @@ int WebPPictureAllocYUVA(WebPPicture* const picture, int width, int height);
 
 //------------------------------------------------------------------------------
 
-#if WEBP_ENCODER_ABI_VERSION <= 0x0202
+#if WEBP_ENCODER_ABI_VERSION <= 0x0203
 void WebPMemoryWriterClear(WebPMemoryWriter* writer);
 #endif