nextcloud-client: update to 3.1.2, no shibboleth and webkit support, …

…kwallet subpackage

* shibboleth is "highly deprecated" by upstream, will be removed in 3.2.
* webkit support is currently ineffective and difficult to fix.
* fix ~dolphin build options
* nextcloud-client-kwallet: dedicated package for kwallet as credential storage

Closes: #26774

srcpkgs/nextcloud-client-kwallet

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+nextcloud-client

srcpkgs/nextcloud-client/files/kwallet/README.voidlinux

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+nextcloud-client-kwallet package provides a wrapper of nextcloud-client.
+It enforces nextcloud-client to use kwallet as its credential storage.
+This is usefull when user's desktop environment is not KDE/plasma.
+
+Nextcloud-client relies on qtkeychain to choose an appropriate storage backend.
+But qtkeychain chooses kwallet over gnome-keyring only if the DE is KDE/Plasma.

srcpkgs/nextcloud-client/files/kwallet/nextcloud.kwallet

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+#!/bin/sh
+# Force usage of KDE kwallet as credential storage via qtkeychain as much as possible.
+# related to https://github.com/void-linux/void-packages/issues/26774
+exec env DESKTOP_SESSION=kde KDE_SESSION_VERSION=5 /usr/bin/nextcloud "$@"