Remove "custom" PDDRV sqlstate.

ext/pdo/pdo_sqlstate.c

@@ -151,8 +151,7 @@ static struct pdo_sqlstate_info err_initializer[] = {
 	{ "IM012",	"DRIVER keyword syntax error" },
 	{ "IM013",	"Trace file error" },
 	{ "IM014",	"Invalid name of File DSN" },
-	{ "IM015",	"Corrupt file data source" },
-	{ "PDDRV",	"Nested unbuffered query, refer to driver error for details" }
+	{ "IM015",	"Corrupt file data source" }
 };
 
 void pdo_sqlstate_fini_error_table(void)

ext/pdo_mysql/mysql_driver.c

@@ -37,7 +37,6 @@ const char *pdo_mysql_get_sqlstate(unsigned int my_errno) {
 	switch (my_errno) {
 		/* import auto-generated case: code */
 #include "php_pdo_mysql_sqlstate.h"
-	case 2014: return "PDDRV"; /* out of sync */
 	default: return "HY000";
 	}
 }