- Merge DUMB commit d31fb2084659b64d07eb0644d9bacfd67059d066 to zdoom.

    Fixed C++11 compilation error on Mac OS X
Shut up warnings from the customized DUMB code.
- Fixed: clang 32-bit compile (I hear it still doesn't run though).
- Applied edward's patch to remove boolean increment.
- fixed: The secret counter was not incremented for items that had the UDMF COUNTSECRET flag set.
- removed unused constants in p_map.cpp.