Bug #52828 Tests that use perl fail when perl is not in path

main.mysqltest skipped on Windows because a perl intentionally does exit(1)
Use exit(2), as exit(1) on Windows is indistinguishable from failing to
execute perl.

mysql-test/t/mysqltest.test

@@ -331,7 +331,7 @@ eval select $mysql_errno as "after_!errno_masked_error" ;
 --exec illegal_command
 --cat_file does_not_exist
 --perl
-  exit(1);
+  exit(2);
 EOF
 
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