[Backport to Xwayland 23.1] Backport fixes
This backports some fixes from master, namely:
- commit 24171bb7 - xwayland: Include <sys/type.h> where needed
- commit 76a329e5 - xwayland: fix error path when modifier is not supported
- commit c6f2598a - xwayland: don't fall back to wl_drm with explicit modifier
- commit d5dd3f3c - xwayland: Use MAP_PRIVATE for keymaps
- commit 5a742ab8 - Add libdrm 2.4.109 requirement
- commit 6f0b9dee - xwayland: use drmDevice to compare DRM devices
- commit 21b3dad2 - Allow disabling the SHAPE extension at runtime
- commit 08b0ea09 - xwayland/glamor/gbm: Only use modifier gbm API if explicit
- commit af255b16 - xwayland/glamor/gbm: Initialize explicit buffer params in helper
- commit 9bd83c02 - xwayland/glamor/gbm: Use helper for implicit buffer params too
- commit 4e20d96e - xwayland/glamor: Track if a xwl_pixmap uses explicit modifiers
- commit 1209a1bb - xwayland: Fix uninitialised value created by a stack allocation