configure.ac: add xcb-fixes to the XCB DRI3 list
The XCB module is used by the VL targets. Thus omitting it can lead to
link-time errors due to unresolved symbols.
Other DRI3 users such as the Vulkan WSI and the dri3 loader helper do
not use an update region in their xcb_present_pixmap() call. We will
look into that at a later stage.
Fixes: acf3d2afab0 ("configure: check once for DRI3 dependencies")
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=101110
Signed-off-by: Emil Velikov <emil.velikov@collabora.com>