Unify Unwind-API prototypes for ARM, IA64, x64, and i386.
Add Windows 8-API prototypes for function-table manipulations.


git-svn-id: svn+ssh://svn.code.sf.net/p/mingw-w64/code/trunk@6236 4407c894-4637-0410-b4f5-ada5f102cad1