external/webp: enable WEBP_USE_THREAD
this serializes dsp function pointer initialization avoiding the
potential for multiple initialization or code reordering in the
non-threaded case. if the latter were to occur there would be a race
condition where the pointers had the potential to be uninitialized,
resulting in a crash.
Test: aosp_arm-eng aosp_arm64-eng aosp_x86-eng aosp_x86_64-eng
1 file changed