memmap 0.7 is unmaintained (RUSTSEC-2020-0077); memmap2 is a drop-in
replacement. Drop the unused shlex dependency.
Each resize created a new wl_shm_pool that was never destroyed; keep the
pool on the buffer and destroy it with it. A wl_buffer.release for a
buffer we didn't consider acquired used to underflow refcnt and wedge
rendering. Fix the lifetime-elision warnings while here.
Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
