cargo incremental builds breaks Rust BPF, locally disable it (#2674)

ci/test-stable-perf.sh

@@ -24,9 +24,9 @@ ci/affects-files.sh \
 make -C programs/bpf/c tests
 
 # Must be built out of band
-#make -C programs/bpf/rust/noop/ all
+make -C programs/bpf/rust/noop/ all
 
-FEATURES=bpf_c,erasure,chacha
+FEATURES=bpf_c,bpf_rust,erasure,chacha
 if [[ $(uname) = Darwin ]]; then
   ./build-perf-libs.sh
 else

programs/bpf/rust/noop/makefile

@@ -104,7 +104,7 @@ $(OUT_DIR)/%.ll: $(SRC_DIR)/*
 	@echo "[cargo] $@ ($<)"
 	$(_@)mkdir -p $(OUT_DIR)
 	$(_@)rm -f $(CARGO_OUT_DIR)/deps/$(TARGET_NAME)-*.ll
-	$(_@)$(CARGO) $(CARGO_FLAGS)
+	$(_@)export CARGO_INCREMENTAL=0; $(CARGO) $(CARGO_FLAGS)
 	$(_@)cp $(CARGO_OUT_DIR)/deps/$(TARGET_NAME)-*.ll $(OUT_DIR)/$(TARGET_NAME).ll
 
 .PRECIOUS: $(OUT_DIR)/%.o