Report len as -1 instead of INT_MAX

Per docs it should be -1. And would be on 32-bit systems, but
not on 64-bit systems.

(cherry picked from commit 3911158)

Author: nikic

ext/pdo_sqlite/sqlite_statement.c

@@ -282,7 +282,7 @@ static int pdo_sqlite_stmt_describe(pdo_stmt_t *stmt, int colno)
 
 	str = sqlite3_column_name(S->stmt, colno);
 	stmt->columns[colno].name = zend_string_init(str, strlen(str), 0);
-	stmt->columns[colno].maxlen = 0xffffffff;
+	stmt->columns[colno].maxlen = SIZE_MAX;
 	stmt->columns[colno].precision = 0;
 
 	switch (sqlite3_column_type(S->stmt, colno)) {

ext/pdo_sqlite/tests/bug79664.phpt

@@ -24,7 +24,7 @@ array(6) {
   ["name"]=>
   string(1) "1"
   ["len"]=>
-  int(4294967295)
+  int(-1)
   ["precision"]=>
   int(0)
   ["pdo_type"]=>