curl: add support for the IPFS protocols:

- ipfs://<cid>
- ipns://<cid>

This allows you tu use ipfs in curl like:
curl ipfs://<cid>
and
curl ipns://<cid>

For more information consult the readme at:
https://curl.se/docs/ipfs.html

Closes #8805

src/tool_getparam.c

@@ -116,6 +116,7 @@ static const struct LongShort aliases[]= {
   {"*r", "create-dirs",              ARG_BOOL},
   {"*R", "create-file-mode",         ARG_STRING},
   {"*s", "max-redirs",               ARG_STRING},
+  {"*S", "ipfs-gateway",             ARG_STRING},
   {"*t", "proxy-ntlm",               ARG_BOOL},
   {"*u", "crlf",                     ARG_BOOL},
   {"*v", "stderr",                   ARG_FILENAME},
@@ -1137,6 +1138,10 @@ ParameterError getparameter(const char *flag, /* f or -long-flag */
           err = PARAM_BAD_NUMERIC;
         break;
 
+      case 'S': /* ipfs gateway url */
+        GetStr(&config->ipfs_gateway, nextarg);
+        break;
+
       case 't': /* --proxy-ntlm */
         if(!feature_ntlm) {
           err = PARAM_LIBCURL_DOESNT_SUPPORT;