contrib: vpx: update to 1.15.0

This release includes new codec control for key frame filtering, more Neon optimizations, improvements to RTC encoding and bug fixes.

• Upgrading: This release is ABI compatible with the previous release. Temporal filtering improvement that can be turned on with the new codec control VP9E_SET_KEY_FRAME_FILTERING, which gives 1+% BD-rate saving with minimal encoder time increase. libwebm is upgraded to libwebm-1.0.0.31-10-g3b63004
• Enhancement: Neon optimization speed up Scene detection is allowed for all RTC speeds (>=5) Support profile guided optimizations Delta quantization parameters for UV channels for vp8 is supported in RTC rate control library Rate control parameters are reset and maximum QP is enforced on scene changes in SVC when there is no inter-layer prediction
• Bug fixes: Fix to Uninitialized scalar variable in vp9_rd_pick_inter_mode_sb() Fix to Integer-overflow in resize_multistep Fix to Heap-buffer-overflow in vpx_sad64x64_avx2 Fix to Crash in vpx_sad8x8_sse2 Fix to Assertion in write_modes Support profile guided optimizations Fix to Integer-overflow in encode_frame_to_data_rate Fix to Integer-overflow in vp9_svc_check_reset_layer_rc_flag Fix to core dump error from /usr/bin/tools/tiny_ssim --help Fix to use-of-uninitialized-value in vp9_setup_tpl_stats Fix to Undefined-shift in vp9_cyclic_refresh_setup Fix to redundant && __GNUC__ preproc check Fix to valgrind warning in EncodeAPI.OssFuzz69906 Fix to Index-out-of-bounds in vp8_rd_pick_inter_mode Fix to Integer-overflow in vp8_pick_frame_size Fix to Use-of-uninitialized-value in vpx_codec_peek_stream_info Fix to log clutters with the message "Warning: Desired height too large" Fix to Integer-overflow in vp9_svc_adjust_avg_frame_qindex Fix to integer overflows caused by huge target bitrate, frame rate, or g_timebase numerator or denominator Fix to missing license headers Fix to build failure for Android Armv7 Fix to integer overflows in image helpers Fix to Integer-overflow in vp9_calc_iframe_target_size_one_pass_cbr Fix to Heap-buffer-overflow in vp9_pick_inter_mode Fix to Segv in vp9_multi_thread_tile_init Fix to Use-of-uninitialized-value in vp9_row_mt_sync_mem_dealloc Fix to Crash in mbloop_filter_vertical_edge_c Fix to Check failed in CheckUnwind Fix to Heap-buffer-overflow in write_modes_b and vpx_write Fix to Possible signed integer overflow found in vpx_codec_encode Fix to build conflicts between Abseil and libaom/libvpx in Win ARM64 builds Fix to build failures on aarch64 Fix to Data race in libvpx ARM NEON Fix to Heap-buffer-overflow in scale_plane_1_to_2_phase_0 Fix to integer overflow in encode_mb_row Fix to Floating-point-exception in vp8_pick_frame_size Fix to Heap-buffer-overflow in vp9_enc_setup_mi Fix to build failure with --target=arm64-win64-vs17 Fix to heap-buffer-overflow write in vpx_img_read() Fix to C vs armv8-linux-gcc encode mismatches for y4m_360p_10bit_input Fix to Null-dereference READ in ml_predict_var_rd_partitioning Fix to Heap-buffer-overflow in vpx_scaled_2d_ssse3 Fix to Crash in convolve_horiz Fix to Ill in vpx_scaled_2d_ssse3 Fix to Global-buffer-overflow in cost_coeffs