libvpx: Pull from upstream

source/libvpx/vpx/vpx_encoder.h

Index: source/libvpx/vpx/vpx_encoder.h
===================================================================
--- source/libvpx/vpx/vpx_encoder.h	(revision 290053)
+++ source/libvpx/vpx/vpx_encoder.h	(working copy)
@@ -637,14 +637,12 @@
      */
     unsigned int           ss_number_layers;
 
-#if CONFIG_SPATIAL_SVC
     /*!\brief Enable auto alt reference flags for each spatial layer.
      *
      * These values specify if auto alt reference frame is enabled for each
      * spatial layer.
      */
     int                    ss_enable_auto_alt_ref[VPX_SS_MAX_LAYERS];
-#endif
 
     /*!\brief Target bitrate for each spatial layer.
      *
@@ -704,10 +702,6 @@
    * is not thread safe and should be guarded with a lock if being used
    * in a multithreaded context.
    *
-   * In XMA mode (activated by setting VPX_CODEC_USE_XMA in the flags
-   * parameter), the storage pointed to by the cfg parameter must be
-   * kept readable and stable until all memory maps have been set.
-   *
    * \param[in]    ctx     Pointer to this instance's context.
    * \param[in]    iface   Pointer to the algorithm interface to use.
    * \param[in]    cfg     Configuration to use, if known. May be NULL.
@@ -741,10 +735,6 @@
    * instead of this function directly, to ensure that the ABI version number
    * parameter is properly initialized.
    *
-   * In XMA mode (activated by setting VPX_CODEC_USE_XMA in the flags
-   * parameter), the storage pointed to by the cfg parameter must be
-   * kept readable and stable until all memory maps have been set.
-   *
    * \param[in]    ctx     Pointer to this instance's context.
    * \param[in]    iface   Pointer to the algorithm interface to use.
    * \param[in]    cfg     Configuration to use, if known. May be NULL.