rust/Makefile: cleanup "clean" targets

Remove maintainer-clean-local, this is not needed.

In distclean-local, remove "rust/dist" and "rust/vendor" as they are
created during "make dist".

In "clean-local", remove "rust/target" and "rust/gen" as they are
created during a normal "make".

rust/Makefile.am

@@ -69,16 +69,10 @@ uninstall-local:
 	rm -f "$(DESTDIR)$(libdir)/$(RUST_SURICATA_LIBNAME)"
 
 clean-local:
-	rm -rf target
-if HAVE_CBINDGEN
-	rm -rf gen dist
-endif
+	rm -rf target gen
 
 distclean-local:
-	rm -f Cargo.lock
-
-maintainer-clean-local:
-	rm -rf vendor gen
+	rm -rf vendor dist
 
 check:
 	cd $(abs_top_srcdir)/rust && \