rust: build depends on ffi/Cargo.toml.in

rust/Makefile.am

@@ -69,7 +69,7 @@ CARGO_ENV +=	LOCALSTATEDIR=$(e_localstatedir)
 # To pass specific CFLAGS to Lua.
 CARGO_ENV +=	SURICATA_LUA_SYS_CFLAGS="$(SURICATA_LUA_SYS_CFLAGS)"
 
-all-local: Cargo.toml
+all-local: Cargo.toml ffi/Cargo.toml
 	mkdir -p $(abs_top_builddir)/rust/gen
 	cd $(abs_top_srcdir)/rust && \
 		CC="$(CC)" AR="$(AR)" RANLIB="$(RANLIB)"\
@@ -232,3 +232,5 @@ Cargo.toml: Cargo.toml.in
 update-lock: Cargo.toml
 	$(CARGO_ENV) $(CARGO) update
 	mv Cargo.lock Cargo.lock.in
+
+ffi/Cargo.toml: ffi/Cargo.toml.in