libgpgme: bump version to 1.5.2

- Bump version to 1.5.2
- Add a hash file

[Thomas: fix typo in commit title.]

Signed-off-by: Vicente Olivert Riera <Vincent.Riera@imgtec.com>
Reviewed-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>