Added dxgi1_2.h missing in previous commit.

git-svn-id: svn+ssh://svn.code.sf.net/p/mingw-w64/code/trunk@6558 4407c894-4637-0410-b4f5-ada5f102cad1
Add secapi wrapper for strerror_s

git-svn-id: svn+ssh://svn.code.sf.net/p/mingw-w64/code/trunk@6559 4407c894-4637-0410-b4f5-ada5f102cad1