recipetool: create: skip values extracted from spec files containing macros

If a value we extract from a spec file contains an unexpanded macro
(e.g. %{macroname}) then we should discard it since we're not seeing the
actual value and we don't have an easy way of expanding it at the
moment.

This fixes for example getting %{name} as the recipe name when running
the following:

recipetool create https://github.com/gavincarr/mod_auth_tkt.git

(From OE-Core rev: eee56a19cda051da6267f808cd3a04a4c644acb3)

Signed-off-by: Paul Eggleton <paul.eggleton@linux.intel.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

scripts/lib/recipetool/create_buildsys.py

@@ -863,6 +863,10 @@ class SpecFileRecipeHandler(RecipeHandler):
                             break
                     if len(foundvalues) == len(valuemap):
                         break
+        # Drop values containing unexpanded RPM macros
+        for k in list(foundvalues.keys()):
+            if '%' in foundvalues[k]:
+                del foundvalues[k]
         if 'PV' in foundvalues:
             if not validate_pv(foundvalues['PV']):
                 del foundvalues['PV']