Merge changes from Poky bitbake 1.8

Update bitbake-dev to have extra fixes from Poky's internal (1.8) version of bitbake.
Should be able to use bitbake-dev with Poky now.

git-svn-id: https://svn.o-hand.com/repos/poky/trunk@5340 311d38ba-8fff-0310-9ca6-ca027cbcb966

bitbake-dev/lib/bb/parse/__init__.py

@@ -50,6 +50,10 @@ def cached_mtime_noerror(f):
             return 0
     return __mtime_cache[f]
 
+def update_mtime(f):
+    __mtime_cache[f] = os.stat(f)[8]
+    return __mtime_cache[f]
+
 def mark_dependency(d, f):
     if f.startswith('./'):
         f = "%s/%s" % (os.getcwd(), f[2:])