masks.c: mark the Wayland include conditional, and drop the (void) cast

appdata: drop the two url types the AppImage runner's validator rejects

The Linux nightly died packaging the AppImage: appimagetool validates the
bundled metainfo with the runner's appstream-util, and Ubuntu 22.04 ships one
older than the 0.8.3 the file was validated against locally. It does not know
<url type="vcs-browser"> or <url type="contribute"> and fails the build on
"<url> type invalid". Both are optional niceties for the Flathub listing;
homepage, bugtracker and help stay. Validated again with appstream-util 0.8.3
and appstreamcli 1.1, both clean.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

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