sslh: update to 1.20

Fixed maintainer entry.

Added patch fixing compilation.

Signed-off-by: Rosen Penev <rosenp@gmail.com>
(cherry picked from commit ded3ad41b8)

net/sslh/patches/010-format.patch

@@ -0,0 +1,11 @@
+--- a/sslh-main.c
++++ b/sslh-main.c
+@@ -167,7 +167,7 @@ void cmd_ssl_to_tls(int argc, char* argv[])
+             strcpy(argv[i], "--tls");
+             /* foreground option not parsed yet, syslog not open, just print on
+              * stderr and hope for the best */
+-            fprintf(stderr, ssl_err_msg);
++            fprintf(stderr, "%s",  ssl_err_msg);
+         }
+     }
+ }