A quite frequent problem after sysupgrading from an older, SSL enabled build
is that ustream-ssl is not installed so uhttpd fails to come up again due to
https listening directives in the preserved configuration.
Skip key/cert and ssl listen options when libustream-ssl.so is not present.
Signed-off-by: Jo-Philipp Wich <jow@openwrt.org>
SVN-Revision: 42284