cosmetics: light include cleanup

remove some unused includes

Change-Id: I07fabf707e8eac7f204757e68dab1057fd21aef1

src/enc/config.c

@@ -9,7 +9,6 @@
 //
 // Author: Skal (pascal.massimino@gmail.com)
 
-#include <assert.h>
 #include "../webp/encode.h"
 
 #if defined(__cplusplus) || defined(c_plusplus)

src/enc/cost.c

@@ -9,8 +9,6 @@
 //
 // Author: Skal (pascal.massimino@gmail.com)
 
-#include <assert.h>
-
 #include "./cost.h"
 
 #if defined(__cplusplus) || defined(c_plusplus)

src/enc/filter.c

@@ -9,8 +9,6 @@
 //
 // Author: somnath@google.com (Somnath Banerjee)
 
-#include <math.h>
-
 #include "./vp8enci.h"
 
 #if defined(__cplusplus) || defined(c_plusplus)

src/enc/frame.c

@@ -11,7 +11,6 @@
 
 #include <stdlib.h>
 #include <string.h>
-#include <assert.h>
 #include <math.h>
 
 #include "./vp8enci.h"

src/enc/iterator.c

@@ -9,7 +9,6 @@
 //
 // Author: Skal (pascal.massimino@gmail.com)
 
-#include <stdlib.h>
 #include <string.h>
 
 #include "./vp8enci.h"

src/enc/layer.c

@@ -9,7 +9,6 @@
 //
 // Author: Skal (pascal.massimino@gmail.com)
 
-#include <assert.h>
 #include <stdlib.h>
 
 #include "./vp8enci.h"

src/enc/syntax.c

@@ -10,7 +10,6 @@
 // Author: Skal (pascal.massimino@gmail.com)
 
 #include <assert.h>
-#include <math.h>
 
 #include "./vp8enci.h"
 #include "../dec/webpi.h"  // For chunk-size constants.

src/enc/vp8enci.h

@@ -12,7 +12,7 @@
 #ifndef WEBP_ENC_VP8ENCI_H_
 #define WEBP_ENC_VP8ENCI_H_
 
-#include "string.h"     // for memcpy()
+#include <string.h>     // for memcpy()
 #include "../webp/encode.h"
 #include "../dsp/dsp.h"
 #include "../utils/bit_writer.h"