Similar to toolchains and jpeg, we now offer a way for br2-external
trees to provide their openssl implementation, which gets included in
the openssl choice.
Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Cc: Vadim Kochan <vadim4j@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>