Alexandros Frantzis authored Oct 19, 2018 and Pekka Paalanen committed Feb 06, 2019

Introduce an internal API for dealing with linux sync files,
and use it in the codebase to replace ad-hoc sync file management.

The linux_sync_file_is_valid function is not currently used, but will be
utilized in upcoming commits to implement the
zwp_linux_explicit_synchronization_unstable_v1 protocol.

Changes in v5:
  - Meson support.

Changes in v3:
  - Use parameter name in function documentation.
  - Move kernel UAPI to separate header file.

Changes in v2:
  - Add function documentation
  - Remove linux_sync_file_wait()

Signed-off-by: Alexandros Frantzis <alexandros.frantzis@collabora.com>