cache: Add debug msg for a nonexistant dep file

If a recipe depends on a file, and that file is out of date, we show a
message, but if that file was removed, we do not, until now.

(Bitbake rev: 67984ba0ac2db79874541bc031f2e3e9ff7a6c32)

Signed-off-by: Chris Larson <chris_larson@mentor.com>
Signed-off-by: Richard Purdie <rpurdie@linux.intel.com>

bitbake/lib/bb/cache.py

@@ -278,6 +278,8 @@ class Cache(object):
                 fmtime = bb.parse.cached_mtime_noerror(f)
                 # Check if file still exists
                 if old_mtime != 0 and fmtime == 0:
+                    logger.debug(2, "Cache: %s's dependency %s was removed",
+                                    fn, f)
                     self.remove(fn)
                     return False