automake: ensure staging aclocal dir gets created

Otherwise aclocal fails.

Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

package/automake/automake.mk

@@ -15,7 +15,13 @@ define GTK_DOC_M4_INSTALL
  $(INSTALL) -D -m 0644 package/automake/gtk-doc.m4 $(HOST_DIR)/usr/share/aclocal/gtk-doc.m4
 endef
 
+# ensure staging aclocal dir exists
+define HOST_AUTOMAKE_MAKE_ACLOCAL
+	mkdir -p $(ACLOCAL_DIR)
+endef
+
 HOST_AUTOMAKE_POST_INSTALL_HOOKS += GTK_DOC_M4_INSTALL
+HOST_AUTOMAKE_POST_INSTALL_HOOKS += HOST_AUTOMAKE_MAKE_ACLOCAL
 
 $(eval $(call AUTOTARGETS,package,automake))
 $(eval $(call AUTOTARGETS,package,automake,host))