curl: fix build without TLS

Fixes "configure: error: select TLS backend(s) or disable TLS with --without-ssl."
if all backends are switched off.

pkgs/tools/networking/curl/default.nix

@@ -129,6 +129,8 @@ stdenv.mkDerivation (finalAttrs: {
       # Without this curl might detect /etc/ssl/cert.pem at build time on macOS, causing curl to ignore NIX_SSL_CERT_FILE.
       "--without-ca-bundle"
       "--without-ca-path"
+    ] ++ lib.optionals (!gnutlsSupport && !opensslSupport && !wolfsslSupport) [
+      "--without-ssl"
     ];
 
   CXX = "${stdenv.cc.targetPrefix}c++";