Revert all SASL authzid (new feature) commits

- Revert all commits related to the SASL authzid feature since the next
  release will be a patch release, 7.65.1.

Prior to this change CURLOPT_SASL_AUTHZID  / --sasl-authzid was destined
for the next release, assuming it would be a feature release 7.66.0.
However instead the next release will be a patch release, 7.65.1 and
will not contain any new features.

After the patch release after the reverted commits can be restored by
using cherry-pick:

git cherry-pick a14d72c a9499ff 8c1cc36 c2a8d52 0edf690

Details for all reverted commits:

Revert "os400: take care of CURLOPT_SASL_AUTHZID in curl_easy_setopt_ccsid()."

This reverts commit 0edf6907ae.

Revert "tests: Fix the line endings for the SASL alt-auth tests"

This reverts commit c2a8d52a13.

Revert "examples: Added SASL PLAIN authorisation identity (authzid) examples"

This reverts commit 8c1cc369d0.

Revert "curl: --sasl-authzid added to support CURLOPT_SASL_AUTHZID from the tool"

This reverts commit a9499ff136.

Revert "sasl: Implement SASL authorisation identity via CURLOPT_SASL_AUTHZID"

This reverts commit a14d72ca2f.

lib/curl_sasl.c

@@ -370,9 +370,8 @@ CURLcode Curl_sasl_start(struct SASL *sasl, struct connectdata *conn,
       sasl->authused = SASL_MECH_PLAIN;
 
       if(force_ir || data->set.sasl_ir)
-        result = Curl_auth_create_plain_message(data, conn->sasl_authzid,
-                                                conn->user, conn->passwd,
-                                                &resp, &len);
+        result = Curl_auth_create_plain_message(data, NULL, conn->user,
+                                                conn->passwd, &resp, &len);
     }
     else if(enabledmechs & SASL_MECH_LOGIN) {
       mech = SASL_MECH_STRING_LOGIN;
@@ -454,9 +453,8 @@ CURLcode Curl_sasl_continue(struct SASL *sasl, struct connectdata *conn,
     *progress = SASL_DONE;
     return result;
   case SASL_PLAIN:
-    result = Curl_auth_create_plain_message(data, conn->sasl_authzid,
-                                            conn->user, conn->passwd,
-                                            &resp, &len);
+    result = Curl_auth_create_plain_message(data, NULL, conn->user,
+                                            conn->passwd, &resp, &len);
     break;
   case SASL_LOGIN:
     result = Curl_auth_create_login_message(data, conn->user, &resp, &len);

lib/setopt.c

@@ -2400,12 +2400,6 @@ static CURLcode vsetopt(struct Curl_easy *data, CURLoption option,
     break;
 #endif
 
-  case CURLOPT_SASL_AUTHZID:
-    /* Authorisation identity (identity to act as) */
-    result = Curl_setstropt(&data->set.str[STRING_SASL_AUTHZID],
-                            va_arg(param, char *));
-    break;
-
   case CURLOPT_SASL_IR:
     /* Enable/disable SASL initial response */
     data->set.sasl_ir = (0 != va_arg(param, long)) ? TRUE : FALSE;

lib/url.c

@@ -715,7 +715,6 @@ static void conn_free(struct connectdata *conn)
   Curl_safefree(conn->user);
   Curl_safefree(conn->passwd);
   Curl_safefree(conn->oauth_bearer);
-  Curl_safefree(conn->sasl_authzid);
   Curl_safefree(conn->options);
   Curl_safefree(conn->http_proxy.user);
   Curl_safefree(conn->socks_proxy.user);
@@ -3464,14 +3463,6 @@ static CURLcode create_conn(struct Curl_easy *data,
     }
   }
 
-  if(data->set.str[STRING_SASL_AUTHZID]) {
-    conn->sasl_authzid = strdup(data->set.str[STRING_SASL_AUTHZID]);
-    if(!conn->sasl_authzid) {
-      result = CURLE_OUT_OF_MEMORY;
-      goto out;
-    }
-  }
-
 #ifdef USE_UNIX_SOCKETS
   if(data->set.str[STRING_UNIX_SOCKET_PATH]) {
     conn->unix_domain_socket = strdup(data->set.str[STRING_UNIX_SOCKET_PATH]);

lib/urldata.h

@@ -870,8 +870,7 @@ struct connectdata {
   char *passwd;  /* password string, allocated */
   char *options; /* options string, allocated */
 
-  char *oauth_bearer;     /* bearer token for OAuth 2.0, allocated */
-  char *sasl_authzid;     /* authorisation identity string, allocated */
+  char *oauth_bearer; /* bearer token for OAuth 2.0, allocated */
 
   int httpversion;        /* the HTTP version*10 reported by the server */
   int rtspversion;        /* the RTSP version*10 reported by the server */
@@ -1493,7 +1492,6 @@ enum dupstring {
 #ifdef USE_ALTSVC
   STRING_ALTSVC,                /* CURLOPT_ALTSVC */
 #endif
-  STRING_SASL_AUTHZID,          /* CURLOPT_SASL_AUTHZID */
   /* -- end of zero-terminated strings -- */
 
   STRING_LASTZEROTERMINATED,