libxpm: upgrade to 3.5.17

libxpm: upgrade to 3.5.17

- This upgrade includes multiple security fixes.
CVE-2022-4883
CVE-2022-44617
CVE-2022-46285
CVE-2022-44617
CVE-2023-43788
CVE-2023-43789

- Removed CVE-2022-46285 as it is already fixed by this upgrade.

- License-update: additional copyright holders
f0857c0 man pages: Correct Copyright/License notices
Due to this commit LIC_FILES_CHKSUM is changed

- Disable reading compressed files as that requires compress/uncompress executables.
Following the approach in oe-core/master:
7de4084634 libxpm: upgrade 3.5.14 -> 3.5.15

- Add XORG_EXT to specify tar.xz as upstream has switched from bz2 to xz compression.

Signed-off-by: Siddharth Doshi <sdoshi@mvista.com>
Signed-off-by: Steve Sakoman <steve@sakoman.com>