add gzip and brotli support

client/tools/zlib.sh

@@ -0,0 +1,25 @@
+#!/bin/bash
+
+#compile zlib for use with emscripten
+
+set -x
+set -e
+
+CORE_COUNT=$(nproc --all)
+PREFIX=$(realpath build/zlib-wasm)
+
+cd build
+rm -rf zlib
+git clone -b master --depth=1 https://github.com/madler/zlib
+cd zlib
+
+emconfigure ./configure --static
+emmake make -j$CORE_COUNT
+
+rm -rf $PREFIX
+mkdir -p $PREFIX/include
+mkdir -p $PREFIX/lib
+cp -r *.h $PREFIX/include
+cp -r *.a $PREFIX/lib
+
+cd ../../