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

build/zlib.sh

@@ -0,0 +1,16 @@
+#!/bin/bash
+
+set -euo pipefail
+
+CM_FLAGS=(
+  -DCMAKE_INSTALL_PREFIX=$INSTALL_DIR
+  -DCMAKE_TOOLCHAIN_FILE=$EM_TOOLCHAIN_FILE
+  -DBUILD_SHARED_LIBS=OFF
+  -DSKIP_INSTALL_FILES=ON
+)
+
+mkdir -p build
+cd build
+emmake cmake .. -DCMAKE_C_FLAGS="$CXXFLAGS" ${CM_FLAGS[@]}
+emmake make clean
+emmake make install