bitbake: BBhandler/data: Fix __inherit_cache duplication

The inherits cache contains duplicate entries, some with the full patch, some
just starting classes/xxx. This is a waste of parse time and potentially
error prone. This patch fixes various pieces of code so the absolute paths are
always preferred and work correctly. The inherits_class function did not work
with full paths so the patch fixes this.

(Bitbake rev: f3a71e509af196391ec126d079cf1bd178e62ad5)

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

bitbake/lib/bb/data.py

@@ -357,6 +357,8 @@ def generate_dependencies(d):
 
 def inherits_class(klass, d):
     val = getVar('__inherit_cache', d) or []
-    if os.path.join('classes', '%s.bbclass' % klass) in val:
-        return True
+    needle = os.path.join('classes', '%s.bbclass' % klass)
+    for v in val:
+        if v.endswith(needle):
+            return True
     return False