Build: Allow building serenityOS ext2 root filesystem on macOS host

Toolchain/BuildFuseExt2.sh

@@ -0,0 +1,26 @@
+#!/bin/sh
+DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
+export PATH="/usr/local/opt/m4/bin:$PATH"
+
+die() {
+    echo "die: $*"
+    exit 1
+}
+
+if [[ "$OSTYPE" != "darwin"* ]]; then
+    die "This script makes sense to be run only on macOS"
+fi
+
+mkdir -p "$DIR"/Tarballs
+pushd "$DIR"/Tarballs
+
+if [ ! -d fuse-ext2 ]; then
+    git clone https://github.com/alperakcan/fuse-ext2.git	
+fi
+
+cd fuse-ext2
+./autogen.sh
+CFLAGS="-I/usr/local/include/osxfuse/ -I/$(brew --prefix e2fsprogs)/include" LDFLAGS="-L$(brew --prefix e2fsprogs)/lib" ./configure
+make
+sudo make install
+popd