Merging r6315 through r6325 into 'DFP_headers'

git-svn-id: https://svn.code.sf.net/p/mingw-w64/code@6326 4407c894-4637-0410-b4f5-ada5f102cad1
merge of r6039 through r6326 into 'DFP_crt'

git-svn-id: https://svn.code.sf.net/p/mingw-w64/code@6327 4407c894-4637-0410-b4f5-ada5f102cad1
winbase.h: Make Interlocked* wrappers formatting more readable.

git-svn-id: https://svn.code.sf.net/p/mingw-w64/code@6328 4407c894-4637-0410-b4f5-ada5f102cad1
winbase.h: Fixed Interlocked* wrappers on Cygwin64.

git-svn-id: https://svn.code.sf.net/p/mingw-w64/code@6329 4407c894-4637-0410-b4f5-ada5f102cad1