DEBUG: ssl: export ssl_sock_close() to see its symbol resolved in profiling

This function is one of the few high-profile, unresolved ones in the memory
profile output, let's have it resolve to ease matching of SSL allocations,
which are not easy to follow.
diff --git a/src/ssl_sock.c b/src/ssl_sock.c
index 1a2d7be..58f0413 100644
--- a/src/ssl_sock.c
+++ b/src/ssl_sock.c
@@ -6203,7 +6203,7 @@
 	goto leave;
 }
 
-static void ssl_sock_close(struct connection *conn, void *xprt_ctx) {
+void ssl_sock_close(struct connection *conn, void *xprt_ctx) {
 
 	struct ssl_sock_ctx *ctx = xprt_ctx;