parse/ast: Expand inherit statements before splitting them

This means that statements that expand to more then one entry
such as:

CLASSES = "a b"
inherit ${CLASSES}

work correctly instead of trying to inherit a class called "a b".

(Bitbake rev: 2568e9ace6e6f483e1bf2a9ef2f4d8318d6c85b7)

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

bitbake/lib/bb/parse/parse_py/BBHandler.py

@@ -70,8 +70,8 @@ def supports(fn, d):
 
 def inherit(files, fn, lineno, d):
     __inherit_cache = data.getVar('__inherit_cache', d) or []
+    files = d.expand(files).split()
     for file in files:
-        file = data.expand(file, d)
         if not os.path.isabs(file) and not file.endswith(".bbclass"):
             file = os.path.join('classes', '%s.bbclass' % file)