Library internal only C preprocessor macros FORMAT_OFF_T and FORMAT_OFF_TU

remain in use as internal curl_off_t print formatting strings for the internal
*printf functions which still cannot handle print formatting string directives
such as "I64d", "I64u", and others available on MSVC, MinGW, Intel's ICC, and
other DOS/Windows compilers.

This reverts previous commit part which did:

FORMAT_OFF_T  -> CURL_FORMAT_CURL_OFF_T
FORMAT_OFF_TU -> CURL_FORMAT_CURL_OFF_TU

lib/cookie.c

@@ -940,7 +940,7 @@ static char *get_netscape_format(const struct Cookie *co)
     "%s\t"   /* tailmatch */
     "%s\t"   /* path */
     "%s\t"   /* secure */
-    "%" CURL_FORMAT_CURL_OFF_T "\t"   /* expires */
+    "%" FORMAT_OFF_T "\t"   /* expires */
     "%s\t"   /* name */
     "%s",    /* value */
     co->httponly?"#HttpOnly_":"",