Upstream: https://chromium.googlesource.com/webm/libwebp
Version:  1.6.0 (tag v1.6.0, commit 4fa21912338357f89e4fd51cf2368325b59e9bd9)

Vendored by vendor.py in this directory; rerun it to update. It copies the
files upstream compiles into libwebp and libsharpyuv on x86 and Arm and every
header reachable from them, rewrites their includes as paths relative to the
JUCE modules directory, and applies two fixes to src/dsp/cpu.h: one keeping
the x86 SIMD paths off ARM64EC targets, and one shimming the AVX2 intrinsics
missing from GCC before version 11.
