configure: show zstd "no" in summary when built without it

Reported-by: Marc Hörsken
Fixes #5720
Closes #5730

diff --git a/configure.ac b/configure.ac
index ed1b5fcec881c590240ba1b7674491db101c86ef..03fbda34d5f29130fd31faf7946c5ad07392bacc 100755 (executable)
--- a/configure.ac
+++ b/configure.ac
@@ -147,6 +147,7 @@ dnl initialize all the info variables
     curl_ssh_msg="no      (--with-{libssh,libssh2})"
    curl_zlib_msg="no      (--with-zlib)"
  curl_brotli_msg="no      (--with-brotli)"
+   curl_zstd_msg="no      (--with-zstd)"
     curl_gss_msg="no      (--with-gssapi)"
 curl_tls_srp_msg="no      (--enable-tls-srp)"
     curl_res_msg="default (--enable-ares / --enable-threaded-resolver)"