rootfs: Fix MULTILIB_RE_ALLOW to be inherit order independent

This variable is only used by the ipk backend with multilibs.

In order to make it work correctly regardless of inherit order, change
the string to be space delimeted, set using += and add in the regex '|'
sperator at the end of processing.

(From OE-Core rev: 72befdb12568fbc642022ef0a23b269c5b37a638)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/classes-recipe/image.bbclass

@@ -609,7 +609,7 @@ python create_symlinks() {
             bb.note("Skipping symlink, source does not exist: %s -> %s" % (dst, src))
 }
 
-MULTILIBRE_ALLOW_REP =. "${base_bindir}|${base_sbindir}|${bindir}|${sbindir}|${libexecdir}|${sysconfdir}|${nonarch_base_libdir}/udev|/lib/modules/[^/]*/modules.*|"
+MULTILIBRE_ALLOW_REP += "${base_bindir} ${base_sbindir} ${bindir} ${sbindir} ${libexecdir} ${sysconfdir} ${nonarch_base_libdir}/udev /lib/modules/[^/]*/modules.*"
 MULTILIB_CHECK_FILE = "${WORKDIR}/multilib_check.py"
 MULTILIB_TEMP_ROOTFS = "${WORKDIR}/multilib"
 

meta/classes-recipe/rootfs_ipk.bbclass

@@ -29,7 +29,7 @@ OPKG_POSTPROCESS_COMMANDS = ""
 
 OPKGLIBDIR ??= "${localstatedir}/lib"
 
-MULTILIBRE_ALLOW_REP = "${OPKGLIBDIR}/opkg|/usr/lib/opkg"
+MULTILIBRE_ALLOW_REP += "${OPKGLIBDIR}/opkg /usr/lib/opkg"
 
 python () {
 

meta/lib/oe/package_manager/ipk/rootfs.py

@@ -165,7 +165,7 @@ class PkgRootfs(DpkgOpkgRootfs):
     """
     def _multilib_sanity_test(self, dirs):
 
-        allow_replace = self.d.getVar("MULTILIBRE_ALLOW_REP")
+        allow_replace = "|".join((self.d.getVar("MULTILIBRE_ALLOW_REP") or "").split())
         if allow_replace is None:
             allow_replace = ""