Merge pull request #647 from ojeda/skip-rmeta

rust: skip `.rmeta` generation for leaves

Author: ojeda

scripts/Makefile.build

@@ -357,7 +357,7 @@ rust_handle_depfile = \
 
 quiet_cmd_rustc_o_rs = $(RUSTC_OR_CLIPPY_QUIET) $(quiet_modtag) $@
       cmd_rustc_o_rs = \
-	$(rust_common_cmd) --emit=dep-info,obj,metadata $<; \
+	$(rust_common_cmd) --emit=dep-info,obj $<; \
 	$(rust_handle_depfile)
 
 $(obj)/%.o: $(src)/%.rs FORCE