avformat: clarify what package needs to be compiled with SSL support

Try to reduce user confusion.
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavformat/avio.c

@@ -263,7 +263,7 @@ int ffurl_alloc(URLContext **puc, const char *filename, int flags,
 
     *puc = NULL;
     if (av_strstart(filename, "https:", NULL))
-        av_log(NULL, AV_LOG_WARNING, "https protocol not found, recompile with "
+        av_log(NULL, AV_LOG_WARNING, "https protocol not found, recompile FFmpeg with "
                                      "openssl, gnutls,\n"
                                      "or securetransport enabled.\n");
     return AVERROR_PROTOCOL_NOT_FOUND;