configure: remove HAVE_CONFIG_H

This doesn't play well with autotools, and the preprocessor magic is
confusing and unhelpful in the vp8-only context.

Change-Id: I2fcb57e6eb7876ecb58509da608dc21f26077ff1
diff --git a/vpx_codec/vpx_codec.h b/vpx_codec/vpx_codec.h
index d18505c..145ca29 100644
--- a/vpx_codec/vpx_codec.h
+++ b/vpx_codec/vpx_codec.h
@@ -41,14 +41,7 @@
 
 #ifndef VPX_CODEC_H
 #define VPX_CODEC_H
-#ifdef HAVE_CONFIG_H
-#  include "vpx_config.h"
-#endif
-#if defined(HAVE_VPX_PORTS) && HAVE_VPX_PORTS
-#  include "vpx_ports/vpx_integer.h"
-#else
-#  include "vpx_integer.h"
-#endif
+#include "vpx_integer.h"
 #include "vpx_image.h"
 
     /*!\brief Decorator indicating a function is deprecated */