Fixed some more bugs in Django format (valid)

After fixing the old issues, Alexander's fuzzing scripts
still found some more hashes that made Django segfault...
Merge pull request #480 from frank-dittrich/bleeding-jumbo

Fixed some more bugs in Django format (valid)
Make a warning() function in common_opencl_pbkdf2.c static.
warning() should be static also in the header
Merge pull request #481 from rejsmont/bleeding-jumbo

warning() should be static also in the header