Update installer patch with GRUB help text and fix fstools build

Adds --bootloader and --filesystem to installer help text. Fixes
fstools host build by symlinking local/ directory alongside recipes/
so the ext4-blockdev path dependency resolves correctly.

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

mk/fstools.mk

@@ -16,6 +16,7 @@ else
 	rm -rf $@ $@.partial
 	mkdir -p $@.partial
 	ln -s ../../recipes $@.partial/recipes
+	ln -s ../../local $@.partial/local
 	$(MAKE) fstools_fetch PODMAN_BUILD=$(GOING_TO_PODMAN_AGAIN)
 
 	# Compile installer and redoxfs for host (may be outside of podman container)