vpx_codec.h: include vpx/*.h -> ./*.h

This matches the other includes and also fixes a compile issue in
chromium.

Change-Id: I45e00a1454f7ed948aa3b96b04cc5946b1d02985
diff --git a/tools.mk b/tools.mk
index b3c8cb0..23adcee 100644
--- a/tools.mk
+++ b/tools.mk
@@ -28,6 +28,9 @@
 ALL_SRCS        = $(foreach ex,$(TOOLS),$($(notdir $(ex:.c=)).SRCS))
 CFLAGS += -I../include
 
+ifneq ($(CONFIG_CODEC_SRCS), yes)
+  CFLAGS += -I../include/vpx
+endif
 
 # Expand all tools sources into a variable containing all sources
 # for that tools (not just them main one specified in TOOLS)
diff --git a/vpx/vpx_codec.h b/vpx/vpx_codec.h
index 39bc54b..e91cd9e 100644
--- a/vpx/vpx_codec.h
+++ b/vpx/vpx_codec.h
@@ -42,8 +42,8 @@
 extern "C" {
 #endif
 
-#include "vpx/vpx_image.h"
-#include "vpx/vpx_integer.h"
+#include "./vpx_image.h"
+#include "./vpx_integer.h"
 
 /*!\brief Decorator indicating a function is deprecated */
 #ifndef DEPRECATED