Migrate all libs (remove fdk-aac due to license issue and wavpack as no longer supported)

build/libwebp.sh

@@ -0,0 +1,26 @@
+#!/bin/bash
+
+set -euo pipefail
+
+CM_FLAGS=(
+  -DCMAKE_INSTALL_PREFIX=$INSTALL_DIR
+  -DCMAKE_TOOLCHAIN_FILE=$EM_TOOLCHAIN_FILE
+  -DBUILD_SHARED_LIBS=OFF
+  -DZLIB_LIBRARY=$INSTALL_DIR/lib
+  -DZLIB_INCLUDE_DIR=$INSTALL_DIR/include
+  -DWEBP_ENABLE_SIMD=ON
+  -DWEBP_BUILD_ANIM_UTILS=OFF
+  -DWEBP_BUILD_CWEBP=OFF
+  -DWEBP_BUILD_DWEBP=OFF
+  -DWEBP_BUILD_GIF2WEBP=OFF
+  -DWEBP_BUILD_IMG2WEBP=OFF
+  -DWEBP_BUILD_VWEBP=OFF
+  -DWEBP_BUILD_WEBPINFO=OFF
+  -DWEBP_BUILD_WEBPMUX=OFF
+  -DWEBP_BUILD_EXTRAS=OFF
+)
+
+mkdir -p build
+cd build
+emmake cmake .. -DCMAKE_C_FLAGS="$CXXFLAGS" ${CM_FLAGS[@]}
+emmake make install