recipetool/append: Fix selftest failure with multilib

If you have multilib enabled, it finds lib32-base-files instead of
base-files for test_recipetool_appendfile_basic causing a test
failure. Add a fix for this.

(From OE-Core rev: c9821a56da9c6e341408ea21e0d8a4cc5291dba6)

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

scripts/lib/recipetool/append.py

@@ -280,6 +280,9 @@ def appendfile(args):
                 alternative_pns.append(pn[1:])
             elif pn.startswith('!'):
                 postinst_pns.append(pn[1:])
+            elif selectpn:
+                # hit here with multilibs
+                continue
             else:
                 selectpn = pn