WIP: pathfinder recipe

recipes/pathfinder/recipe.sh

+GIT=https://gitlab.redox-os.org/redox-os/pathfinder.git
+BRANCH=redox
+GIT_UPSTREAM=https://github.com/servo/pathfinder.git
+BUILD_DEPENDS=(llvm mesa zlib)
+BRANCH=redox
+CARGOFLAGS="--manifest-path examples/canvas_glutin_minimal/Cargo.toml"
+
+function recipe_build {
+    sysroot="$(realpath ../sysroot)"
+    cp -p "$ROOT/Xargo.toml" "Xargo.toml"
+    set -x
+    xargo rustc --target "$TARGET" --release ${CARGOFLAGS} \
+        -- \
+        -L "${sysroot}/lib" \
+        -C link-args="$("${PKG_CONFIG}" --libs osmesa) -lglapi -lz -lstdc++ -lc -lgcc"
+    set +x
+    skip=1
+}
+
+function recipe_stage {
+    dest="$(realpath $1)"
+    mkdir -pv "$dest/bin"
+    cp -v "target/${TARGET}/release/canvas_glutin_minimal" "$dest/bin/pathfinder"
+    skip=1
+}