d/rules: drop virtiofsd switch

virtiofsd is no longer part of QEMU 8.0. It got replaced by a separate
implementation written in Rust, which will be its own package.

See QEMU commit 0aaf44776e ("Merge tag 'pull-virtiofs-20230216b' of
https://gitlab.com/dagrh/qemu into staging").

Signed-off-by: Fiona Ebner <f.ebner@proxmox.com>

debian/rules

@@ -84,7 +84,6 @@ endif
 	--enable-usb-redir \
 	--enable-virglrenderer \
 	--enable-virtfs \
-	--enable-virtiofsd \
 	--enable-zstd
 
 build: build-arch build-indep