xserver-xorg: upgrade 21.1.6 -> 21.1.18

xorg-server 21.1.17
This release contains the fixes for the issues reported in today's security
advisory: https://lists.x.org/archives/xorg/2025-June/062055.html

   * CVE-2025-49175
   * CVE-2025-49176
   * CVE-2025-49177
   * CVE-2025-49178
   * CVE-2025-49179
   * CVE-2025-49180

Additionally, this release includes a fix for CVE-2022-49737 which was
issued after the fix was merged back in 2022 and several other various fixes.

Ref: https://lists.x.org/archives/xorg-announce/2025-June/003609.html

xorg-server 21.1.18
This release contains an additional fix for CVE-2025-49176 from June 17
security advisory: https://lists.x.org/archives/xorg/2025-June/062055.html

Ref: https://lists.x.org/archives/xorg-announce/2025-June/003612.html

(From OE-Core rev: 5cefb53aa0e19cceb35bcb46cdfee3cfa27b8e94)

Signed-off-by: Vijay Anusuri <vanusuri@mvista.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
(cherry picked from commit a59b385184fb3a548dc27310fd04d64351d8dfba)
Signed-off-by: Steve Sakoman <steve@sakoman.com>

meta/recipes-graphics/xorg-xserver/xserver-xorg_21.1.16.bb → meta/recipes-graphics/xorg-xserver/xserver-xorg_21.1.18.bb

@@ -3,7 +3,7 @@ require xserver-xorg.inc
 SRC_URI += "file://0001-xf86pciBus.c-use-Intel-ddx-only-for-pre-gen4-hardwar.patch \
            file://0001-Avoid-duplicate-definitions-of-IOPortBase.patch \
            "
-SRC_URI[sha256sum] = "b14a116d2d805debc5b5b2aac505a279e69b217dae2fae2dfcb62400471a9970"
+SRC_URI[sha256sum] = "c878d1930d87725d4a5bf498c24f4be8130d5b2646a9fd0f2994deff90116352"
 
 # These extensions are now integrated into the server, so declare the migration
 # path for in-place upgrades.