meson: Add roxmltree rust dependency

Will be used for a simple isaspec implementation in rust.

Signed-off-by: Christian Gmeiner <cgmeiner@igalia.com>
Reviewed-by: @LingMan
Reviewed-by: Eric Engestrom <eric@igalia.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/28869>

.gitlab-ci/meson/build.sh

@@ -104,7 +104,7 @@ rm -rf _build
 meson setup _build \
       --native-file=native.file \
       --wrap-mode=nofallback \
-      --force-fallback-for perfetto,syn,paste,pest,pest_derive,pest_generator,pest_meta \
+      --force-fallback-for perfetto,syn,paste,pest,pest_derive,pest_generator,pest_meta,roxmltree \
       ${CROSS+--cross "$CROSS_FILE"} \
       -D prefix=$PWD/install \
       -D libdir=lib \