/usr/lib/mysql-testsuite/include/have_csv.inc is in mysql-testsuite-5.6 5.6.16-1~exp1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 | disable_query_log;
--require r/true.require
select (support = 'YES' or support = 'DEFAULT') as `TRUE` from information_schema.engines where engine = 'csv';
enable_query_log;
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