Add platform-header to make difference between desktop and app mode

git-svn-id: https://mingw-w64.svn.sourceforge.net/svnroot/mingw-w64/trunk@5631 4407c894-4637-0410-b4f5-ada5f102cad1
Fix typo.

git-svn-id: https://mingw-w64.svn.sourceforge.net/svnroot/mingw-w64/trunk@5632 4407c894-4637-0410-b4f5-ada5f102cad1
Add new API poclass, and make batclass and atsmedia headers dependent to winapifamily

git-svn-id: https://mingw-w64.svn.sourceforge.net/svnroot/mingw-w64/trunk@5633 4407c894-4637-0410-b4f5-ada5f102cad1
Add Windows 8 defines

git-svn-id: https://mingw-w64.svn.sourceforge.net/svnroot/mingw-w64/trunk@5634 4407c894-4637-0410-b4f5-ada5f102cad1
add apdevpkey definitions and make devpropdef winapi-family dependent

git-svn-id: https://mingw-w64.svn.sourceforge.net/svnroot/mingw-w64/trunk@5635 4407c894-4637-0410-b4f5-ada5f102cad1