Use bio_err not stderr in apps.

Except for VMS startup code.

Reviewed-by: Richard Levitte <levitte@openssl.org>

apps/s_server.c

diff --git a/apps/s_server.c b/apps/s_server.c
index 6bd0257..8354386 100644
--- a/apps/s_server.c
+++ b/apps/s_server.c
@@ -2376,8 +2376,8 @@
     {
         while (i <= 0 && SSL_get_error(con, i) == SSL_ERROR_WANT_X509_LOOKUP
                && SSL_state(con) == SSL3_ST_SR_CLNT_HELLO_C) {
-            fprintf(stderr,
-                    "LOOKUP from certificate callback during accept\n");
+            BIO_printf(bio_err,
+                       "LOOKUP from certificate callback during accept\n");
             i = SSL_accept(con);
         }
     }
@@ -2811,10 +2811,10 @@
 
 #ifdef RENEG
                 total_bytes += i;
-                fprintf(stderr, "%d\n", i);
+                BIO_printf(bio_err, "%d\n", i);
                 if (total_bytes > 3 * 1024) {
                     total_bytes = 0;
-                    fprintf(stderr, "RENEGOTIATE\n");
+                    BIO_printf(bio_err, "RENEGOTIATE\n");
                     SSL_renegotiate(con);
                 }
 #endif