news/newsstar: fix OpenSSL detection & cleanups

OpenSSL detection was broken because it looked for SSL_library_init(),
which has been gone since OpenSSL 1.1.0 already. Patch to look for
OPENSSL_init_ssl() instead.

Replace @exec by @postexec.

Add USES=ncurses.

Rearrange Makefile to reduce complaints from portclippy and portlint.