rsvg: use plain builtype to ensure CARGO_PROFILE_* is respected

Author: lovell

build/posix.sh

@@ -352,7 +352,7 @@ sed -i'.bak' "/^if host_system in \['windows'/s/, 'linux'//" meson.build
 cargo update --workspace
 # Remove the --static flag from the PKG_CONFIG env since Rust does not
 # parse that correctly.
-PKG_CONFIG=${PKG_CONFIG/ --static/} meson setup _build --default-library=static --buildtype=release --strip --prefix=${TARGET} ${MESON} \
+PKG_CONFIG=${PKG_CONFIG/ --static/} meson setup _build --default-library=static --buildtype=plain --strip --prefix=${TARGET} ${MESON} \
   -Dintrospection=disabled -Dpixbuf{,-loader}=disabled -Ddocs=disabled -Dvala=disabled -Dtests=false \
   ${RUST_TARGET:+-Dtriplet=$RUST_TARGET}
 meson install -C _build --tag devel