curl.h: add CURLE_TOO_LARGE

A new error code to be used when an internal field grows too large, like
when a dynbuf reaches its maximum. Previously it would return
CURLE_OUT_OF_MEMORY for this, which is highly misleading.

Ref: #12268
Closes #12269

include/curl/curl.h

@@ -631,6 +631,7 @@ typedef enum {
   CURLE_PROXY,                   /* 97 - proxy handshake error */
   CURLE_SSL_CLIENTCERT,          /* 98 - client-side certificate required */
   CURLE_UNRECOVERABLE_POLL,      /* 99 - poll/select returned fatal error */
+  CURLE_TOO_LARGE,               /* 100 - a value/data met its maximum */
   CURL_LAST /* never use! */
 } CURLcode;
 

include/curl/urlapi.h

@@ -63,6 +63,7 @@ typedef enum {
   CURLUE_BAD_SLASHES,         /* 28 */
   CURLUE_BAD_USER,            /* 29 */
   CURLUE_LACKS_IDN,           /* 30 */
+  CURLUE_TOO_LARGE,           /* 31 */
   CURLUE_LAST
 } CURLUcode;