Mac and cross platform fixes

Latest v1.2 binaries built for MacOS X 10.8 64bit.  Sorry, but I am not equipped to build for older systems.

https://s3.amazonaws.com/captemulation/dmg/dogecoin-qt.dmg

 - Should make qmake happy for pc/mac builds (did not check PC)
 - Fixes macdockiconhandler.h