Add source for mingw-w64 v4.0.4.

Source downloaded from
http://sourceforge.net/projects/mingw-w64/files/mingw-w64/mingw-w64-release/

Bug: http://b/26523949
Change-Id: I5e228167a5604f43973ca08f06c656eff42c42e6
6101 files changed
tree: bfe61e7cfab0f5d4cedd8f55e03fcf178151a3c4
  1. mingw-w64-v4.0.4/