Ensure that selecting the wpa-supplicant-mesh package actually packages the
wpa_supplicant binary with SAE support and add missing dependency on OpenSSL.
Signed-off-by: Alexis Green <alexis@cessp.it>
[Jo-Philipp Wich: slightly reword commit message for clarity]
Signed-off-by: Jo-Philipp Wich <jo@mein.io>