[psteinroe]

build.rs copied the vendored libpg_query tree into OUT_DIR and compiled every *.c it found there. The copy overwrites files but never removes any, so an OUT_DIR that a build of another libpg_query version left behind still holds that version's files, and the glob compiles them too. That's what broke Lint, Codegen and Test on #1072: CI restored the target/ that main saved after #1055, and the branch, still on libpg_query 17, compiled the 18.1.0 pg_query_is_utility_stmt.c from it (unknown type name 'PgQueryIsUtilityResult'). Switching branches locally does the same.

What changed

• The vendored layout now points at the submodule itself, so the C sources, headers, pg_query.proto and the include paths all come from vendor/libpg_query. Nothing is copied anymore. OUT_DIR only holds the objects, libpg_query.a and bindings.rs. The copy wasn't needed: nothing writes into the tree, and the system layout already reads its prefix in place. fs_extra is no longer a build dependency.
• The build script now prints rerun-if-changed for the submodule's headers, src, protobuf and vendor, plus build.rs and LIBPG_QUERY_PATH. Before, cc's rerun-if-env-changed lines turned off Cargo's default "rerun when any file of the package changes", so a change to the submodule alone (e.g. git submodule update after switching branches) didn't rebuild the C library at all.

The CI caches stay as they are. moonrepo/setup-rust restores by the prefix setup-rustcargo-v1-<os>, so a key that includes the submodule commit would still restore main's latest cache, and the tree-sitter cache only holds the generated grammar. A branch that is still on libpg_query 17 needs main merged in (it then gets #1055 and this fix), because CI runs the branch's own build.rs.

Tests

• Reproduced the CI failure: built pgls_query on main before this change, then checked out the commit before chore(query): upgrade libpg_query to 18.1.0 #1055 (same Cargo.lock, same OUT_DIR) and built again. It failed with the same pg_query_is_utility_stmt.c errors as fix(suppressions): end lines at \n only, with the shared line index #1072.
• With this change: filled the OUT_DIR with the 18.1.0 copies plus a .c file that only contains #error, then built the commit before chore(query): upgrade libpg_query to 18.1.0 #1055 with this build.rs and switched back to this branch. Both builds pass, and the archive built from the 17 sources has no pg_query_is_utility_stmt.
• Touching a file under vendor/libpg_query/src now reruns the build script; before, the crate stayed Fresh. Deleting one reruns it too.
• cargo test -p pgls_query, cargo clippy -p pgls_query --all-targets -- -D warnings.