Try to fix mysqli_field tests

Those tests seem to fail when people have a different default collation, so
try to fix by specifying utf8_general_ci explicitely.

Author: nikic

ext/mysqli/tests/table.inc

@@ -12,12 +12,12 @@ if (!mysqli_query($link, 'DROP TABLE IF EXISTS test')) {
 	exit(1);
 }
 
-if (!mysqli_query($link, 'CREATE TABLE test(id INT, label CHAR(1), PRIMARY KEY(id)) ENGINE=' . $engine)) {
+if (!mysqli_query($link, 'CREATE TABLE test(id INT, label CHAR(1) COLLATE utf8_general_ci, PRIMARY KEY(id)) ENGINE=' . $engine)) {
 	printf("Failed to create test table: [%d] %s\n", mysqli_errno($link), mysqli_error($link));
 	exit(1);
 }
 
 if (!mysqli_query($link, "INSERT INTO test(id, label) VALUES (1, 'a'), (2, 'b'), (3, 'c'), (4, 'd'), (5, 'e'), (6, 'f')")) {
 	printf("[%d] %s\n",  mysqli_errno($link), mysqli_error($link));
 }
-?>
+?>