This effectively reverts upstream commit e79df3516d3e ("build: add
libustream and certs to default pkgs").
The libustream-wolfssl library conflicts with the libustream-mbedtls
we are selecting in fff-web-ui and is probably much bigger.
Signed-off-by: Adrian Schmutzler <freifunk@adrianschmutzler.de>
Reviewed-by: Fabian Bläse <fabian@blaese.de>
