refpolicy: mark as architecture independent

Use PKGARCH:=all to declare this package to be free of any
architecture dependent code.

Signed-off-by: Daniel Golle <[email protected]>

package/system/refpolicy/Makefile

@@ -7,7 +7,7 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=refpolicy
 PKG_VERSION:=2.20200229
-PKG_RELEASE:=2
+PKG_RELEASE:=3
 
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.bz2
 PKG_SOURCE_URL:=https://github.com/SELinuxProject/refpolicy/releases/download/RELEASE_2_20200229
@@ -29,6 +29,7 @@ define Package/refpolicy
   CATEGORY:=Base system
   TITLE:=SELinux reference policy
   URL:=http://selinuxproject.org/page/Main_Page
+  PKGARCH:=all
 endef
 
 define Package/refpolicy/description