mailcap: Fix license format QA error

Fix following QA error:

,----
| WARNING: Recipe mailcap, LICENSE (PD MIT) has invalid format, LICENSES
|     must have operator "([&|() ])" between them.
`----

Signed-off-by: Otavio Salvador <otavio@ossystems.com.br>
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>