openssl: Ensure SSL certificates are stored on sysconfdir
Debian and other generic distributions has moved the certificates for
sysconfdir (/etc/ssl) and made the libdir content to link for it.
This provides several advantages specially for read-only
rootfs. Another benefit is that it ensures foreign implementations
(e.g: BoringSSL, from Chromium, when running with OpenSSL backend for
the certificates) to find the content correctly.
Signed-off-by: Otavio Salvador <otavio@ossystems.com.br> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>